It's been reported that the Los Angeles County coroner has ruled Jeff Conway's death accidental and caused by major internal infection.

The 60-year old star of TV series 'Taxi' and 'Babylon 5' and the movie 'Grease,' died back in May after he was hospitalized with pneumonia and sepsis.

Although Conaway had struggled with chronic substance abuse for years, Los Angeles County coroner Craig Harvey told the AP that coroners did not conduct a toxicology test -- Conaway had been hospitalized for weeks prior to his death, so his blood would have come back clean.

However, Harvey added that when Conaway entered the hospital on May 10 opiates and other drugs were in his system. It was initially reported that Conaway may have accidentally overdosed on prescription painkillers after he was found unconscious at his home.

Conaway shot to fame in 1978 playing Kenickie in the movie 'Grease.' In the same year he began his three-year run on the hit TV series 'Taxi,' alongside Danny DeVito, Christopher Lloyd and Tony Danza.

Paying tribute to Conaway after his death, his 'Taxi' co-star Marilu Henner said he was "the nicest person. ... He was such a sweetheart, you know, a character. He had this wicked sense of humor, but he was so sweet, so sweet, in a way that I think a lot of people don't realize."

In the 1980s Conaway's substance abuse problems made it difficult for him to work, but in the 1990s he landed a steady gig on sci fi drama 'Babylon 5.' Conaway's most recent TV appearance was a stint on 'Celebrity Rehab With Dr. Drew' in 2008, in which his gaunt, shambling appearance shocked fans.

Remember Jeff Conaway in his prime, with his performance of 'Greased Lightning.'