Jeff Conaway – Deceased
Jeff Conaway already had “Greased Lightning” on his mind before the film Grease was ever made. He was an understudy and eventual portrayer of Danny Zuko in the Broadway musical and joining the film cast as Kenickie, Danny’s best friend. As you already know, the film took him down a dark path of pain killers and addiction.
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But after the success of Grease, he starred in the hit TV series Happy Days and Taxi. Conaway ended up leaving Taxi after the third season due to his health issues. Since he was struggling with a substance-abuse for years, Conaway appeared in two seasons of the reality show Celebrity Rehab with Dr. Drew. Conaway later died in 2011 from multiple causes, including pneumonia. He was 61.