Old lady kills cops
 

Hi.

I need help finding a movie or episode from a certain series.
Many years ago i saw an episode or movie about a old lady that killed and burried (in her backyard i think) various cops that showed at her door.
I think it was in black and white. And i think it was from a series.
I've been trying to find it for a looooong time.

Does someone know what episode or movie it is?

Thanks