diff --git a/src/appsignal/client.py b/src/appsignal/client.py
index 8f40272..45b522b 100644
--- a/src/appsignal/client.py
+++ b/src/appsignal/client.py
@@ -1,5 +1,9 @@
 from __future__ import annotations
 
+import os
+import signal
+import subprocess
+import time
 from typing import TYPE_CHECKING
 
 from . import internal_logger as logger
@@ -48,6 +52,21 @@ def start(self) -> None:
         else:
             logger.info("AppSignal not starting: no active config found")
 
+    def stop_agent_processes(self) -> None:
+        logger.info("Killing all AppSignal agent processes")
+
+        processes = subprocess.Popen(["ps", "-A"], stdout=subprocess.PIPE)
+        out, _ = processes.communicate()
+        processes_found = 0
+
+        for line in out.splitlines():
+            if b"appsignal-" in line:
+                pid = int(line.split(None, 1)[0])
+                os.kill(pid, signal.SIGTERM)
+                processes_found += 1
+
+        logger.info(f"AppSignal stopped {processes_found} agent processes")
+
     def _start_probes(self) -> None:
         if self._config.option("enable_minutely_probes"):
             start_probes()
diff --git a/tests/test_client.py b/tests/test_client.py
index 0a4b69f..0ecf787 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -1,6 +1,8 @@
 from __future__ import annotations
 
 import os
+import signal
+from unittest.mock import patch
 
 from appsignal.agent import agent
 from appsignal.client import Client
@@ -98,3 +100,21 @@ def test_client_inactive():
         os.environ.get("OTEL_INSTRUMENTATION_HTTP_CAPTURE_HEADERS_SERVER_REQUEST")
         is None
     )
+
+
+@patch("subprocess.Popen.communicate")
+@patch("os.kill")
+def test_client_stop(mock_kill, mock_communicate):
+    mock_communicate.return_value = (
+        b"123 ??        12:00.00 /bin/appsignal-agent\n124 ??        12:00.00 /bin/appsignal-agent\n",
+        None,
+    )
+    mock_kill.return_value = None
+
+    client = Client(active=True, name="MyApp", push_api_key="0000-0000-0000-0000")
+    client.start()
+
+    client.stop_agent_processes()
+
+    mock_kill.assert_called(123, signal.SIGTERM)
+    mock_kill.assert_called(124, signal.SIGTERM)