He was taken to UCLA Medical Center in Santa Monica.
Sources tell TMZ that at 10:30 a.m. Monday, a chaplain was called to Tom's hospital room and that the family has a do not resuscitate order. The singer is not expected to live throughout the day, but he's still clinging to life, TMZ says.
The 66-year-old became famous with Tom Petty and the Heartbreakers in 1978 with "Breakdown.".
Stay with ABC7 News for updates on this developing story.
Tom Petty showed no brain activity, pulled off life support after cardiac arrest says TMZ. Just saw him at Greek. Day keeps getting worse. pic.twitter.com/9HqWOuul3m— Dan Noyes (@dannoyes) October 2, 2017
IN MEMORIAM: Celebrities and notable figures who have recently passed away