Herschel Walker said he once played Russian roulette as he struggled with a personality disorder.

"To challenge death like I was doing, you start saying, there's a problem here," the former NFL running back said during an interview broadcast last night on ABC's

Nightline

.

Walker suffers from dissociative identity disorder, formerly known as multiple personality disorder. His experiences are chronicled in his book,

Breaking Free

, which is to be released this week.

The 46-year-old Walker was a Heisman Trophy winner at Georgia and played 12 seasons in the NFL, including three (1992-94) with the Eagles.

He says he had the condition during his playing days but did not realize it. He does not remember winning the Heisman in 1982 or darker events, such as threatening his wife at the time.

Walker has been in treatment for eight years but does not take medication. He believes his condition has improved. "I've totally changed from back then to where I am today," he says.

Saints.

Running back Deuce McAllister, coming off the second knee surgery of his career, will remain with New Orleans for at least one more season, a team source said.

McAllister, who was due a $1 million roster bonus by April 15, worked out a deal that cleared the way for him to remain on the roster. McAllister was out of the country and not available for comment.

Cardinals.

Arizona signed defensive lineman Bryan Robinson to a two-year contract. Robinson, an 11-year veteran, played with the Cincinnati Bengals last season.

Chiefs.

Kansas City signed return specialist B.J. Sams to a one-year contract and fullback Chris Manderino to a two-year deal. Sams, who played his first three seasons with Baltimore, missed 15 games last season with torn knee ligaments.

Former Colt dies.

Buzz Nutter, the center for Johnny Unitas on NFL championship teams with the Baltimore Colts in 1958 and 1959, has died. He was 77.

He died Saturday of heart failure in La Plata, Md., the Raymond Funeral Home in La Plata said. Nutter played in the NFL from 1954 to 1965 and was picked for the Pro Bowl in 1962.

CFL player dies.

Canadian Football League linebacker Jamacia Jackson was found unresponsive at his girlfriend's home and pronounced dead at a hospital in Sumter, S.C.

The Hamilton Tiger-Cats said the 26-year-old's cause of death was not immediately known.

Jackson played safety for South Carolina from 2001 to '04. He signed with the Tennessee Titans in 2005 as an undrafted free agent but was released during training camp.

Noteworthy.

Dolphins great Dan Marino will be the featured commencement speaker at his alma mater, the University of Pittsburgh. The pro and college Hall of Fame quarterback will speak April 27 at Petersen Events Center, 25 years after graduating.