Grant Imahara experienced painful headaches in the days before his fatal brain aneurysm

TMZ

TMZ reports the former MythBusters host was hospitalized Saturday night after feeling dizzy and experiencing severe neck and back pain and numbness in his legs while having dinner at home with his girlfriend in Los Angeles. Imahara underwent two surgeries and was being prepped for a third surgery Monday when "doctors discovered the extent of the damage was too sever," says TMZ. "Grant was wholly unresponsive, and the decision was made to take him off life support."