(CBS/AP) WEST PALM BEACH, Fla. - An autopsy report confirms Monkees star Davy Jones died of a heart attack.
The report obtained Thursday by The Associated Press shows the 66-year-old Jones had severe build-up in his arteries.
Toxicology reports came back negative for any sign of drugs in his system other than cannabinoids, a class of drugs that includes marijuana. However, that played no role in his death.
The report also notes some congestion in the singer's lungs.
Jones rocketed to the top of the 1960s music charts along with his bandmates in The Monkees, captivating audiences with hits including "Daydream Believer" and "I'm a Believer." He died Feb. 29 near his home in Indiantown, Fla.
Jones was on tour just days before his death and had a series of concerts lined up for 2012.
The late singer's family and friends recently got together for a special tribute in New York called "Davy Jones Memorial: An Evening of Music & Memories." Monkees singer-drummer Micky Dolenz and bassist Peter Tork, along with Jones' good friend, vocalist Deana Martin performed at the event.