'Young and the Restless' Star Michael Muhney -- Gets Real Handsy ... During Final Show Appearance

"Young and the Restless" star Michael Muhney has been killed off on the show in a bizarre way ... after menacingly reaching for something between his co-star's legs.

No, it's not an H.R. complaint ... it was for Muhney's final "Y&R" appearance where his character Adam bought the farm by driving off a cliff.

TMZ broke the story ... Muhney was fired last month for allegedly groping 20-year-old co-star Hunter King's breasts on 2 different occasions.