Jimmy Hayes, a former Boston Bruins winger and NCAA champion, who was found dead in his Massachusetts home on Aug. 23, died from "acute intoxication" with traces of fentanyl and cocaine in his system, the Hayes family said Sunday. 

Hayes’ wife, Kristen, told The Boston Globe that she received a call from the Massachusetts state medical examiner’s office confirming the results of the autopsy, which listed Hayes’ cause of death as "acute intoxication due to the combined effects of fentanyl and cocaine."

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"I was completely shocked,’’ Kristen Hayes told the newspaper. "I was so certain that it had nothing to do with drugs. I really thought it was a heart attack or anything that wasn’t that."

Anton Blidh of the Boston Bruins celebrates with Jimmy Hayes after scoring his first NHL goal against the New York Islanders during the third period at TD Garden on Dec. 20, 2016, in Boston, Massachusetts. The Islanders defeated the Bruins, 4-2.

Anton Blidh of the Boston Bruins celebrates with Jimmy Hayes after scoring his first NHL goal against the New York Islanders during the third period at TD Garden on Dec. 20, 2016, in Boston, Massachusetts. The Islanders defeated the Bruins, 4-2. (Maddie Meyer/Getty Images)

She continued: "It didn’t make any sense, so it was hard. I was hoping to get a different phone call when they called. I was hoping to get some clarity and I was shocked to hear that it was that. … He never showed any signs of a struggle at home."

Details surrounding the 31-year-old’s death were not immediately known. The Globe reported at the time that law enforcement responded to Hayes’ home where he was pronounced dead. 

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Unlike his wife, Hayes’ father, Kevin Hayes, did not seem as surprised by the news of his son’s cause of death. 

"I’m an addict myself,’’ he told The Globe. "I’m sober a long, long time, but I know how powerful this stuff is. I was in shock when it happened, but then I started putting stuff together in my head … I know what addiction does. I know about addiction."

Jimmy Hayes of the Boston Bruins waits for a faceoff against the Buffalo Sabres at the TD Garden on Dec. 26, 2015, in Boston, Massachusetts.

Jimmy Hayes of the Boston Bruins waits for a faceoff against the Buffalo Sabres at the TD Garden on Dec. 26, 2015, in Boston, Massachusetts. (Brian Babineau/NHLI via Getty Images)

Kevin Hayes told the newspaper that he had suspected his son had been abusing pain medication because of injuries and noticed a "change" in him about a year and half ago.

"I said, ‘Jim, I think I see a problem here.’ And he’s 31 years old so I can’t tell him to go get help. So I said, ‘When you want help, I’ll be here for you, pal. Let me know,’" he said. "He called me three weeks later and said, ‘Dad, I’m hooked on these pills. I got injured and I started taking them and I never got off.’ And I said, ‘Well, let’s get you some help.’"

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Kevin Hayes said Jimmy Hayes went to a treatment center and believed his son was on "the path to recovery." 

Kimmy Hayes of the New Jersey Devils stretches on the ice prior to the start of the game against the Florida Panthers at the BB&T Center on March 1, 2018, in Sunrise, Florida.

Kimmy Hayes of the New Jersey Devils stretches on the ice prior to the start of the game against the Florida Panthers at the BB&T Center on March 1, 2018, in Sunrise, Florida. ( Eliot J. Schechter/NHLI via Getty Images)

Hayes was selected by the Toronto Maple Leafs in the second round of the 2008 NHL Draft and would go on to play for the Chicago Blackhawks, Florida Panthers, Bruins and New Jersey Devils.