diff --git a/ts/src/ExecutionConstants.ts b/ts/src/ExecutionConstants.ts
index 11daeab..390286b 100644
--- a/ts/src/ExecutionConstants.ts
+++ b/ts/src/ExecutionConstants.ts
@@ -9,4 +9,5 @@ export const ExecutionConstants = {
   SKIPPED_BY_CONDITION: "Skipped by condition evaluation.",
   EXECUTION_STRATEGY_FAILED: "Execution strategy failed.",
   WORKFLOW_CANCELLED: "Workflow cancelled.",
+  WORKFLOW_DEADLOCKED: "Workflow deadlocked: pending tasks remain with nothing running.",
 };
diff --git a/ts/src/WorkflowExecutor.ts b/ts/src/WorkflowExecutor.ts
index 443ab3f..27c6467 100644
--- a/ts/src/WorkflowExecutor.ts
+++ b/ts/src/WorkflowExecutor.ts
@@ -86,7 +86,11 @@ export class WorkflowExecutor<TContext> {
       }
 
       // Ensure everything is accounted for (e.g. if loop exited early)
-      this.stateManager.cancelAllPending(ExecutionConstants.WORKFLOW_CANCELLED);
+      this.stateManager.cancelAllPending(
+        signal?.aborted
+          ? ExecutionConstants.WORKFLOW_CANCELLED
+          : ExecutionConstants.WORKFLOW_DEADLOCKED,
+      );
 
       const results = this.stateManager.getResults();
       this.eventBus.emit("workflowEnd", { context: this.context, results });