Kathy Hutchins/Hutchins Photo
10/01/2011 at 03:00 PM EDT
An autopsy has revealed the cause of death for Taxi
star Jeff Conaway, who passed away
at age 60 last May.
The actor, who publicly struggled with addiction, died from a major internal infection, the Associated Press
A coroner says that a toxicology test was not conducted because Conaway was hospitalized for weeks before his death, so his blood would have tested clean.
The actor was taken off life support on May 27 after being hospitalized with pneumonia and sepsis.
Conaway worked with Dr. Drew Pinsky and appeared on Celebrity Rehab
. Pinsky told PEOPLE
that the actor "was a terribly complex case with chronic pain, opiate addiction and severe childhood trauma."