A medical examiner in Michigan said an autopsy has determined that Columbus Blue Jackets goaltender Matiss Kivlenieks died of chest trauma from an errant fireworks mortar blast and not a fall, as authorities previously reported.

Police in Novi, Michigan, said the mortar-style firework tilted slightly and started to fire toward people nearby Sunday night. The 24-year-old Kivlenieks was in a hot tub and tried to get clear with several other people, Lt. Jason Meier said.