Kathie Lee Gifford, widow of Frank Gifford, says NFL legend 'was dying long before he died'

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Frank Gifford is widely regarded as one of the best players in NFL history. He was a six-time All-Pro, spent his entire career with the New York Giants and is a member of the team's Ring of Honor.

Gifford died of natural causes at his Connecticut home in 2015 at the age of 84.

The Pro Football Hall of Famer's family previously said signs of the degenerative disease chronic traumatic encephalopathy (CTE) were discovered in his brain following his death.

Longtime television personality Kathie Lee Gifford, along with her and Gifford's son Cody, shared some details about their experiences with Frank in their last days together.

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Kathie Lee Gifford and Frank Gifford, seen here in 2008, were married nearly 30 years and had two children. (Richard Corkery)

Kathie Lee and Cody spoke to People ahead of the commercial release of the documentary "Requiem for a Running Back."

"The NFL gave my father a life," Cody told People. "But, at the same time, there were dangers."

WHAT IS CTE?

Gifford's son recalled one of the final nights he spent with him, saying "in the span of one minute or two minutes … he had forgotten everything I had just said."

Frank Gifford moved to the broadcasting booth shortly after he retired from the NFL. In the 1980s he became one of the most recognizable voices of "Monday Night Football," handling play-by-play duties for the 1985 Super Bowl between the San Francisco 49ers and Miami Dolphins.

Kathie Lee Gifford, Cody, Cassidy and Frank Gifford.  (Bruce Glikas/FilmMagic)

"Requiem for a Running Back" tells the story of former football star Lewis Carpenter. Following Lewis'