Rear Window ending explained (spoilers)

[Johnsonmidge]

The neighbour (Thorwald) did kill his wife. Thorwald catches on to Jimmy Stewart and then hunts him down in his apartment. Being in a wheel chair he's practically defenseless. Thorwald manages to throw him out the window but then gets arrested. Stewart re-breaks both his legs and continues to see Lisa (Grace Kelly). (Lisa is not wearing a wedding ring in the last shot).