He died on his 116th day of his age.
Ralph Neely = 116

He was in Super Bowl VI, on January 16, or 1/16

You could also say he died 115 days after his birthday.
Cowboys are 11-5 @ his time of death
-He was in Super Bowl XII on January 15, or 1/15

He joined the Dallas Cowboys for the ’65-’66 season, which was 56-years before this season.
He is dead in year of Super Bowl 56
Baltimore Colts = 56 (Who drafted him in ’65)
Society of Jesus = 56
Offensive Lineman = 263 (56th prime)
-Jesuit = 78
-Sunday = 78
-Ad maiorem Dei gloriam = 116

As for the date he died, it was the day the NFL began talking about moving the Super Bowl to Dallas.

Link.

Dallas = 13
LA = 13
-Neely played for Dallas for 13-years