Delete PlayerController

How can i delete a PlayerController?

I tried this:

mNonPlayerController->getBody0()->removeNodeUpdateNotify();
mNonPlayerController->getBody0()->removeForceAndTorqueCallback();
mNonPlayerController->getBody0()->removeDestructorCallback();

delete mNonPlayerController->getBody0();

and i tried this:

if(mNonPlayerController)
delete mNonPlayerController;

In the second one i got a memory error when the newton world made an update, the first one i got an heap memory error after some collisions.
Thanks in advance!