Frank Gifford

Kathie Lee Gifford says her late husband Frank Gifford suffered from a traumatic brain injury most likely caused during his NFL career ... and has donated his brain to be studied. Gifford -- an NFL Hall of Famer -- died back in August at the age of 84 ... and now the Gifford family says he was…

Football great Frank Gifford died suddenly Sunday morning ... according to a statement from his wife Kathie Lee and their kids. Gifford's family says he passed away of natural causes at their Connecticut home. He was 84. Gifford was an NFL Hall of Famer with the NY Giants ... and also a famous…