diff --git a/src/platforms/ios/runner-session.ts b/src/platforms/ios/runner-session.ts
index 15ce285a..663e5788 100644
--- a/src/platforms/ios/runner-session.ts
+++ b/src/platforms/ios/runner-session.ts
@@ -6,7 +6,7 @@ import {
   type ExecBackgroundResult,
 } from '../../utils/exec.ts';
 import { withKeyedLock } from '../../utils/keyed-lock.ts';
-import { isProcessAlive } from '../../utils/process-identity.ts';
+import { isProcessAlive, isProcessGroupAlive } from '../../utils/process-identity.ts';
 import type { DeviceInfo } from '../../utils/device.ts';
 import { buildSimctlArgsForDevice } from './simctl.ts';
 import {
@@ -192,7 +192,9 @@ async function stopRunnerSessionInternal(
       new Promise<void>((resolve) => setTimeout(resolve, RUNNER_STOP_WAIT_TIMEOUT_MS)),
     ]);
   } catch {}
-  await killRunnerProcessTree(session.child.pid, 'SIGKILL');
+  if (isRunnerProcessTreeAlive(session.child.pid)) {
+    await killRunnerProcessTree(session.child.pid, 'SIGKILL');
+  }
   cleanupTempFile(session.xctestrunPath);
   cleanupTempFile(session.jsonPath);
   await session.simulatorSetRedirect?.release();
@@ -274,6 +276,11 @@ function isRunnerProcessAlive(pid: number | undefined): boolean {
   return isProcessAlive(pid);
 }
 
+function isRunnerProcessTreeAlive(pid: number | undefined): boolean {
+  if (!pid) return false;
+  return isRunnerProcessAlive(pid) || isProcessGroupAlive(pid);
+}
+
 async function killRunnerProcessTree(
   pid: number | undefined,
   signal: 'SIGINT' | 'SIGTERM' | 'SIGKILL',
diff --git a/src/utils/__tests__/process-identity.test.ts b/src/utils/__tests__/process-identity.test.ts
index 8726ce9d..9b434991 100644
--- a/src/utils/__tests__/process-identity.test.ts
+++ b/src/utils/__tests__/process-identity.test.ts
@@ -3,6 +3,7 @@ import assert from 'node:assert/strict';
 import {
   isAgentDeviceDaemonCommand,
   isProcessAlive,
+  isProcessGroupAlive,
   readProcessStartTime,
   readProcessCommand,
 } from '../process-identity.ts';
@@ -11,6 +12,10 @@ test('isProcessAlive returns false for invalid pid', () => {
   assert.equal(isProcessAlive(-1), false);
 });
 
+test('isProcessGroupAlive returns false for invalid pid', () => {
+  assert.equal(isProcessGroupAlive(-1), false);
+});
+
 test('readProcessStartTime returns value for current process', () => {
   const startTime = readProcessStartTime(process.pid);
   if (startTime === null) {
diff --git a/src/utils/process-identity.ts b/src/utils/process-identity.ts
index cdd9c518..91cf9ba5 100644
--- a/src/utils/process-identity.ts
+++ b/src/utils/process-identity.ts
@@ -18,6 +18,16 @@ export function isProcessAlive(pid: number): boolean {
   }
 }
 
+export function isProcessGroupAlive(pid: number): boolean {
+  if (!Number.isInteger(pid) || pid <= 0) return false;
+  try {
+    process.kill(-pid, 0);
+    return true;
+  } catch (err) {
+    return (err as NodeJS.ErrnoException).code === 'EPERM';
+  }
+}
+
 export function readProcessStartTime(pid: number): string | null {
   if (!Number.isInteger(pid) || pid <= 0) return null;
   try {