Jeff Conaway, the personable actor who won television fame on the sitcom “Taxi” and movie success in the musical “Grease” three decades ago and who later publicly struggled with drug and alcohol abuse, died Friday in Los Angeles. He was 60.

He died of complications of pneumonia at Encino Tarzana Medical Center after being taken off life support Thursday, a talent representative, Phil Brock, said.

Conaway was found unconscious at his home in the Encino section of the city May 11 and was kept in a coma medically without ever regaining consciousness, Brock said.

He said Conaway had been struggling with back problems and treating himself with painkillers while in weakened health.

Conaway’s addictions to alcohol and drugs were well known because of his appearances in 2008 on the reality series “Celebrity Rehab With Dr. Drew,” starring Drew Pinsky. Conaway often appeared high and belligerent on the show. He had agreed to participate against the wishes of his agents, Brock said.

Conaway said numerous back surgeries were responsible for his addiction to painkillers. In early 2010 he had a serious fall that left him with a brain hemorrhage, a broken hip and a fractured neck.

Conaway spoke openly of his problems in 2008 when he appeared on Howard Stern’s radio show and told the host, “I’ve tried to commit suicide 21 times.” Asked about his methods, he replied, “Mostly it’s been with pills.”

In late February and early March, Conaway and his girlfriend of seven years, Victoria Spinoza, a singer who records as Vikki Lizzi, filed temporary restraining orders against each other, trading accusations of theft and physical violence.

Conaway had continued to work in films and television in recent years, but his career had plummeted since his greatest popularity, in the late 1970s and early ‘80s.

The film version of “Grease,” starring a rebellious John Travolta (as Danny Zuko) and a wholesome Olivia Newton-John (Sandy) as improbable 1950s high school sweethearts, opened in June 1978, with Conaway in the supporting role of Kenickie, Travolta’s bad-boy sidekick. The tough-talking but vulnerable Kenickie goes through his own trauma, believing that his girlfriend, Rydell High’s bad girl Rizzo (Stockard Channing), may be pregnant.

Three months later, “Taxi,” a sitcom about a group of New York cabdrivers, had its premiere on ABC. The show’s cast included Judd Hirsch, Danny DeVito, Andy Kaufman, Tony Danza, Christopher Lloyd and Marilu Henner. Conaway’s character, Bobby Wheeler, was a vain and handsome aspiring actor who never seemed to get a break in his show business career.

In an admiring review of the show in 1979, John J. O’Connor, writing in The New York Times, described a scene in which Bobby had accidentally let his friend Tony’s two pet fish die.

“I guess it was just their time,” Bobby tells Tony desperately, adding that maybe the deaths were “one of those murder-suicide things.”

The series lasted five seasons, but Conaway left after the fourth. In 1989, he explained his reason for the departure to The Toronto Star: “In ‘Taxi,’ I kept doing the same scene for three years. I was underused.”