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Jones' autopsy also showed cannabinoids, a class of drugs that includes marijuana, in his system, but found they played no role in his death.
Davy Jones' autopsy reports have confirmed that the lead singer of the Monkees died of a heart attack, the Associated Press reported.
The report was obtained Thursday by the AP, and shows that Jones, who died at age 66 in February, had severe build-up in his arteries.
More from GlobalPost: Davy Jones, lead singer with The Monkees, dies aged 66
The autopsy's toxicology reports also found cannabinoids, a class of drugs that includes marijuana, in Jones' system, CBS News reported. However, the drugs were not found to have played a role in his death. No other drugs were found in his system, according to the report.
It is unclear if the cannabinoids in question were from smoking marijuana, or from something else, TMZ reported.
Jones' band the Monkees were a Beatles-inspired American pop group comprised of singer-drummer Micky Dolenz, guitarist Michael Nesmith and bassist Peter Tork, who got together in 1966, and are widely known for their hits "Daydream Believer" and "I’m a Believer," GlobalPost reported.
The four also starred in their own self-titled TV show between 1966 and 1968.
Jones was on tour at the time of his death, and had a series of concerts lined up for 2012, CBS News reported.
The lead singer's family and friends held a tribute in New York called "Davy Jones Memorial: An Evening of Music & Memories," where Micky Dolenz and Peter Tork performed, according to CBS News.