Oh noes! One of our favorite and colorful characters of Celebrity Rehab succeeded in OD'ing.

Grease star Jeff Conaway is in a deep coma in hospital after taking an overdose of painkillers, it has emerged.

The actor, who played T-Bird Kenickie in the classic 1978 film, is unlikely to pull through, according to his manager.

Conaway has now been in a California hospital for a week after being found unconscious on the floor of his Encino home on May 11.

This is one messed up guy.