Tom Martinez, the longtime coach and mentor of New England Patriots quarterback Tom Brady, died Tuesday on his 66th birthday, a source confirmed to ESPN.com senior NFL writer John Clayton. The Patriots offered their condolences to Martinez's family on Twitter on Tuesday night. "Our sincere condolences go out to the Martinez family & all those he mentored throughout his incredible career," the team wrote. Martinez, whose health had been declining due to complications from diabetes, was seeking a kidney transplant. He had been a mentor to many football players in the Bay Area. "We were convinced the dialysis was slowly killing him," Martinez's wife, Olivia, told the New York Daily News on Tuesday. Read more: http://espn.go.com/boston/nfl/story...om-martinez-longtime-mentor-tom-brady-dies-66