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A spokesperson for the coroner's office confirmed the news to ET on Wednesday.
ET looks back at our time spent with the late rock legend.
The late rock legend's fellow musicians are reeling from their longtime friend's death at age 66.
Sheryl Crow also dedicated her song ‘If It Makes You Happy’ to Petty.
John Mayer, the Foo Fighters, Grace Jones and Melissa Etheredge are among the celebs who've put their own spins on Petty's iconic tunes.
Petty, lead singer of Tom Petty and the Heartbreakers, known for hits like 'American Girl' and many more, was rushed to a hospital after being found unconscious in his Malibu home on Sunday night.
The rock legend died on Monday after suffering cardiac arrest at his home in Malibu, California.
The musician's daughter is paying tribute to her dad as he reportedly fights for his life.
The music legend, 66, was rushed to the hospital Sunday night after being found unconscious in full cardiac arrest at his Malibu home.
The music industry paid tribute to the legendary musician after he was found unconscious and rushed to hospital.
The legendary singer, best known as the lead singer for Tom Petty and the Heartbreakers, died on Monday.
The 66-year-old singer last performed with the Heartbreakers on Sept. 29.