Unknown Horror Flick - Need the name

Hi,

I'm trying to find the name of an older black and white horror movie from the 50s or 60s I believe. All I recall is a gathering of persons for the reading of a Will or something. The deceased is either reanimated or a robot. He is in a hidden niche in a castle or something and when called upon to leave the niche and kill one of his legs twitches before taking a step. That's all I remember. If anyone has any ideas please. I asked this question back in 2015 and someone knew but I lost the information.

Thanks!