diff --git a/tui/jobs.py b/tui/jobs.py
index 2c91056..61dc009 100644
--- a/tui/jobs.py
+++ b/tui/jobs.py
@@ -93,12 +93,24 @@ class JobManager:
             except (ProcessLookupError, OSError):
                 pass
 
-    def kill_job(self, job_id: str) -> bool:
+    def kill_job(self, job_id: str) -> str:
+        """Kill a job. Returns a status message for debugging."""
         job = self._jobs.get(job_id)
-        if not job or job._proc is None:
-            return False
-        self._kill_process_group(job._proc)
-        return True
+        if not job:
+            return "job not found"
+        if job._proc is None:
+            return f"proc is None (status={job.status})"
+        pid = job._proc.pid
+        try:
+            pgid = os.getpgid(pid)
+            os.killpg(pgid, signal.SIGKILL)
+            return f"killed pgid={pgid} (pid={pid})"
+        except (ProcessLookupError, PermissionError, OSError) as e:
+            try:
+                job._proc.kill()
+                return f"fallback kill pid={pid} ({e})"
+            except (ProcessLookupError, OSError) as e2:
+                return f"failed: {e}, {e2}"
 
     def kill_running(self) -> None:
         for job in self._jobs.values():
diff --git a/tui/screens/running_tasks.py b/tui/screens/running_tasks.py
index 636a453..f73cbbd 100644
--- a/tui/screens/running_tasks.py
+++ b/tui/screens/running_tasks.py
@@ -104,10 +104,8 @@ class RunningTasksScreen(Screen):
         )
 
     def _do_kill(self, job_id: str) -> None:
-        if job_manager.kill_job(job_id):
-            self.notify("Job killed")
-        else:
-            self.notify("Could not kill job", severity="error")
+        result = job_manager.kill_job(job_id)
+        self.notify(f"Kill: {result}")
 
     def action_go_back(self) -> None:
         self.app.pop_screen()