McNair, 36, played 13 season in the pros, most recently for the Baltimore Ravens in 2007. A woman was also found shot to death in the condo and has been identified but name not released as of yet. McNair was found shot in the head, according to officials.
No suspects are in custody at this time, and the cause of the murder is yet to be determined.
"I don't have any answers for you now as to what's happened, who's responsible," police spokesman Don Aaron said.
McNair, who is most famously known for nearly sending the 1999 Super Bowl to overtime, fell one yard short on the final play of the game to give the St. Louis Rams their first world title.
He was known for his mental toughness, and played through many injuries from the early part to his career until his retirement in April 2008.
"He was one of the finest players to play for our organization and one of the most beloved players by our fans," Titans owner Bud Adams said. "He played with unquestioned heart and leadership and led us to places that we had never reached, including our only Super Bowl."
I will post more details as they are given by Nashville police officials.
It is a sad day for not just the football world, but the sports universe as a whole. A great athlete and much respected individual has left this world too soon, and he will not soon be forgotten.