Casey had a productive career, and his most famous moment came in 1967 for the Rams in the next to last game of the season against the Green Bay Packers.
The Rams needed to win to keep their division title hopes alive, but trailed the Packers 24-20 with under a minute to play.
The Rams then blocked a punt and ran it back to the 5 yard line.
The Rams defeated the Colts the following week to win the Coastal Division title.
In a piece for NFL Films, he expressed his disillusionment with the NFL and professional sports in general, feeling like his creativity and individuality were thwarted by conservative elements in the league and ownership hierarchy.
Casey began his acting career in the film Guns of the Magnificent Seven, a sequel to The Magnificent Seven.
Number one supporter: Footballing HABS and WAGS include (clockwise from top left): England's Siobhan Chamberlain and Leigh Moore, US footballer Lauren and Jrue Holiday, Canada's Kaylyn Kyle with Gabriel Farfan, US footballer Sydney Leroux and Dom Dwyer, and US' Megan Rapinoe with Sera Cahoone.
England goalkeeper Siobhan Chamberlain has her fiancé Leigh Moore on hand to offer encouragement, while Casey Stoney has the support of her partner Megan Harris and their seven-month-old twins Teddy and Tilly.