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Taxi and Grease star Jeff Conaway, who passed away at age 60 last May, died of a major internal infection. Coroners released his official cause of death Friday.

A toxicology test was not conducted on the body of the actor, who publicly struggled with addiction, because he was hospitalized for weeks before his death.

His blood would have tested clean in any case. Jeff Conaway was taken off life support on May 27 after being hospitalized with pneumonia and sepsis.

The troubled Conaway fell into a coma in May and was eventually allowed to pass away by his loved ones when hope for his recovery became non-existent.

He worked with Dr. Drew Pinsky, who called him “a terribly complex case with chronic pain, opiate addiction and severe childhood trauma” on Celebrity Rehab.