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Sib Hashian, drummer for the chart-topping classic rock outfit Boston, died Wednesday evening after collapsing mid-performance aboard a cruise ship. He was 67 years old.

“I can confirm that my father Sib passed away last night,” Hashian’s son Adam tells PEOPLE. “It’s tough to lose him — he was a thoughtful guy with many friends and an amazing grandfather.”

The musician had been booked as part of the Legends of Rock themed cruise when he collapsed without warning partway through his set. Hashian was treated with CPR and a defibrillator onboard, to no avail. The cause of death remains unknown at this time, but Adam tells PEOPLE the family believes it may have been a heart attack.

The voyage began on March 18 in Florida, and was scheduled to make various Caribbean stops including the Bahamas and Puerto Rico. The cruise will continue, with additional musicians performing in tribute to Hashian.

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