diff --git a/torch_ac/utils/penv.py b/torch_ac/utils/penv.py
index 6e5c9f1..6e4f4f1 100644
--- a/torch_ac/utils/penv.py
+++ b/torch_ac/utils/penv.py
@@ -12,8 +12,6 @@ def worker(conn, env):
         elif cmd == "reset":
             obs = env.reset()
             conn.send(obs)
-        elif cmd == "kill":
-            return
         else:
             raise NotImplementedError
 
@@ -36,10 +34,6 @@ def __init__(self, envs):
             p.start()
             remote.close()
 
-    def __del__(self):
-        for local in self.locals:
-            local.send(("kill", None))
-
     def reset(self):
         for local in self.locals:
             local.send(("reset", None))