Jeff Conaway is in a coma following a suspected drug overdose. Conaway is best-known for his roles on Grease and Taxi. More recently, he’s been seen by reality TV watchers on multiple seasons of Celebrity Rehab With Dr. Drew.

Conaway, 60, is currently in critical condition in an Encino-area hospital. Popeater reports that Conaway was found unconscious on May 11, possibly after taking too many pain pills.

His condition is reported as “unresponsive.”