diff --git a/docs/source/features/feature-combination-matrix.md b/docs/source/features/feature-combination-matrix.md
index 8745a20064..d84143c4c5 100644
--- a/docs/source/features/feature-combination-matrix.md
+++ b/docs/source/features/feature-combination-matrix.md
@@ -1,19 +1,23 @@
 # Feature Combination Matrix
 
-| Feature                    | Overlap Scheduler | CUDA Graph | Attention Data Parallelism | Disaggregated Serving | Chunked Prefill | MTP      | EAGLE-3(One Model Engine) | EAGLE-3(Two Model Engine) | Torch Sampler | TLLM C++ Sampler | KV Cache Reuse | Slide Window Attention | Logits Post Processor | Guided Decoding | LoRA |
-| -------------------------- | ----------------- | ---------- | -------------------------- | --------------------- | --------------- | -------- | ------------------------- | ------------------------- | ------------- | ---------------- | -------------- | ---------------------- | --------------------- | --------------- | ---- |
-| Overlap Scheduler          | ---               |            |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |      |
-| CUDA Graph                 | Yes               | ---        |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |      |
-| Attention Data Parallelism | Yes               | Yes        | ---                        |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |      |
-| Disaggregated Serving      | Yes               | Yes        | Yes                        | ---                   |                 |          |                           |                           |               |                  |                |                        |                       |                 |      |
-| Chunked Prefill            | Yes               | Yes        | Yes                        | Yes                   | ---             |          |                           |                           |               |                  |                |                        |                       |                 |      |
-| MTP                        | Yes               | Yes        | Yes                        | Yes                   | Yes             | ---      |                           |                           |               |                  |                |                        |                       |                 |      |
-| EAGLE-3(One Model Engine)  | Yes               | Yes        | Yes                        | Yes                   | Yes             | No       | ---                       |                           |               |                  |                |                        |                       |                 |      |
-| EAGLE-3(Two Model Engine)  | Yes               | Yes        | Yes                        | Yes                   | Yes             | No       | No                        | ---                       |               |                  |                |                        |                       |                 |      |
-| Torch Sampler              | Yes               | Yes        | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | ---           |                  |                |                        |                       |                 |      |
-| TLLM C++ Sampler           | Yes               | Yes        | Yes                        | Yes                   | Yes             | No       | No                        | No                        | No            | ---              |                |                        |                       |                 |      |
-| KV Cache Reuse             | Yes               | Yes        | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | Yes           | Yes              | ---            |                        |                       |                 |      |
-| Slide Window Attention     | Yes               | Yes        | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | Yes           | Yes              | Yes            | ---                    |                       |                 |      |
-| Logits Post Processor      | Yes               | Yes        | Yes                        | No                    | Yes             | No       | No                        | No                        | Yes           | Yes              | Yes            | Yes                    | ---                   |                 |      |
-| Guided Decoding            | Yes               | Yes        | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | Yes           | Yes              | Yes            | Yes                    | Yes                   | ---             |      |
-| LoRA                       | Yes               | No         | Untested                   | Untested              | Untested        | Untested | Untested                  | Untested                  | Yes           | Yes              | Yes            | Yes                    | Yes                   | Untested        | ---  |
+| Feature                    | Overlap Scheduler | CUDA Graph | Tensor Parallelism | Pipeline Parallelism | Expert Parallelism | Helix Parallelism | Attention Data Parallelism | Disaggregated Serving | Chunked Prefill | MTP      | EAGLE-3(One Model Engine) | EAGLE-3(Two Model Engine) | Torch Sampler | TLLM C++ Sampler | KV Cache Reuse | Slide Window Attention | Logits Post Processor | Guided Decoding | LoRA     |
+| -------------------------- | ----------------- | ---------- | ------------------ | -------------------- | ------------------ | ----------------- | -------------------------- | --------------------- | --------------- | -------- | ------------------------- | ------------------------- | ------------- | ---------------- | -------------- | ---------------------- | --------------------- | --------------- | -------- |
+| Overlap Scheduler          | ---               |            |                    |                      |                    |                   |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| CUDA Graph                 | Yes               | ---        |                    |                      |                    |                   |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| Tensor Parallelism         | Yes               | Yes        | ---                |                      |                    |                   |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| Pipeline Parallelism       | Yes               | Yes        | Yes                | ---                  |                    |                   |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| Expert Parallelism         | Yes               | Yes        | Yes                | Yes                  | ---                |                   |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| Helix Parallelism          | Untested          | Yes        | Yes                | Yes                  | Yes                | ---               |                            |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| Attention Data Parallelism | Yes               | Yes        | Yes                | Yes                  | Yes                | Known issues      | ---                        |                       |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| Disaggregated Serving      | Yes               | Yes        | Yes                | Yes                  | Yes                | Yes               | Yes                        | ---                   |                 |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| Chunked Prefill            | Yes               | Yes        | Yes                | Untested             | Yes                | Yes               | Yes                        | Yes                   | ---             |          |                           |                           |               |                  |                |                        |                       |                 |          |
+| MTP                        | Yes               | Yes        | Yes                | No                   | Yes                | No                | Yes                        | Yes                   | Yes             | ---      |                           |                           |               |                  |                |                        |                       |                 |          |
+| EAGLE-3(One Model Engine)  | Yes               | Yes        | Yes                | No                   | Yes                | No                | Yes                        | Yes                   | Yes             | No       | ---                       |                           |               |                  |                |                        |                       |                 |          |
+| EAGLE-3(Two Model Engine)  | Yes               | Yes        | Yes                | No                   | Yes                | No                | Yes                        | Yes                   | Yes             | No       | No                        | ---                       |               |                  |                |                        |                       |                 |          |
+| Torch Sampler              | Yes               | Yes        | Yes                | Yes                  | Yes                | Yes               | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | ---           |                  |                |                        |                       |                 |          |
+| TLLM C++ Sampler           | Yes               | Yes        | Yes                | Yes                  | Yes                | Yes               | Yes                        | Yes                   | Yes             | No       | No                        | No                        | No            | ---              |                |                        |                       |                 |          |
+| KV Cache Reuse             | Yes               | Yes        | Yes                | Yes                  | Yes                | Yes               | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | Yes           | Yes              | ---            |                        |                       |                 |          |
+| Slide Window Attention     | Yes               | Yes        | Yes                | Yes                  | Yes                | Untested          | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | Yes           | Yes              | Yes            | ---                    |                       |                 |          |
+| Logits Post Processor      | Yes               | Yes        | Yes                | Yes                  | Yes                | Yes               | Yes                        | No                    | Yes             | No       | No                        | No                        | Yes           | Yes              | Yes            | Yes                    | ---                   |                 |          |
+| Guided Decoding            | Yes               | Yes        | Yes                | Yes                  | Yes                | Yes               | Yes                        | Yes                   | Yes             | Yes      | Yes                       | Yes                       | Yes           | Yes              | Yes            | Yes                    | Yes                   | ---             |          |
+| LoRA                       | Yes               | No         | Yes                | Yes                  | Untested           | Untested          | Untested                   | Untested              | Yes             | Untested | Untested                  | Untested                  | Yes           | Yes              | Yes            | Yes                    | Yes                   | Untested        | ---      |
diff --git a/tensorrt_llm/_torch/models/modeling_speculative.py b/tensorrt_llm/_torch/models/modeling_speculative.py
index dc4b3b1d54..312d5b1dca 100755
--- a/tensorrt_llm/_torch/models/modeling_speculative.py
+++ b/tensorrt_llm/_torch/models/modeling_speculative.py
@@ -953,6 +953,14 @@ class SpecDecOneEngineForCausalLM(DecoderModelForCausalLM[TModel, TConfig],
             hidden_states = hidden_states[:attn_metadata.num_tokens]
 
         if self.draft_model is not None:
+            # For one-model speculative decoding with PP, only the last PP rank
+            # has valid hidden_states from the target model. The spec_worker (which
+            # runs the draft model loop) should only run on the last PP rank.
+            # Non-last PP ranks return None and let the PP sync handle the results.
+            mapping = self.model.model_config.mapping
+            if mapping.has_pp() and not mapping.is_last_pp_rank():
+                return None
+
             # get logits
             logits = self.logits_processor.forward(
                 hidden_states[spec_metadata.gather_ids],