diff --git a/python/ray/scripts/scripts.py b/python/ray/scripts/scripts.py
index bc21e7c32..26f279d9c 100644
--- a/python/ray/scripts/scripts.py
+++ b/python/ray/scripts/scripts.py
@@ -159,19 +159,24 @@ def stop():
                    "local_scheduler"], shell=True)
 
   # Find the PID of the monitor process and kill it.
-  subprocess.call(["kill $(ps aux | grep monitor.py | awk '{ print $2 }') "
-                   "2> /dev/null"], shell=True)
-
-  # Find the PID of the Redis process and kill it.
-  subprocess.call(["kill $(ps aux | grep redis-server | awk '{ print $2 }') "
-                   "2> /dev/null"], shell=True)
-
-  # Find the PIDs of the worker processes and kill them.
-  subprocess.call(["kill $(ps aux | grep default_worker.py | "
+  subprocess.call(["kill $(ps aux | grep monitor.py | grep -v grep | "
                    "awk '{ print $2 }') 2> /dev/null"], shell=True)
 
+  # Find the PID of the Redis process and kill it.
+  subprocess.call(["kill $(ps aux | grep redis-server | grep -v grep | "
+                   "awk '{ print $2 }') 2> /dev/null"], shell=True)
+
+  # Find the PIDs of the worker processes and kill them.
+  subprocess.call(["kill -9 $(ps aux | grep default_worker.py | "
+                   "grep -v grep | awk '{ print $2 }') 2> /dev/null"],
+                  shell=True)
+
   # Find the PID of the Ray log monitor process and kill it.
-  subprocess.call(["kill $(ps aux | grep log_monitor.py | "
+  subprocess.call(["kill $(ps aux | grep log_monitor.py | grep -v grep | "
+                   "awk '{ print $2 }') 2> /dev/null"], shell=True)
+
+  # Find the PID of the jupyter process and kill it.
+  subprocess.call(["kill $(ps aux | grep jupyter | grep -v grep | "
                    "awk '{ print $2 }') 2> /dev/null"], shell=True)