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Larry Morris, 79, star linebacker for the Chicago Bears

Larry Morris (number 33) and the Bears defense shut down Y.A. Tittle and the Giants to win the 1963 NFL championship.

Robert Riger/Getty Images

Larry Morris (number 33) and the Bears defense shut down Y.A. Tittle and the Giants to win the 1963 NFL championship.

NEW YORK — Larry Morris, 79, the Chicago Bears star linebacker who was named the most valuable player of the 1963 National Football League championship game, in which he stymied New York Giants quarterback Y.A. Tittle to help give the Bears their first league title in 17 years, died Dec. 19 in Austell, Ga., outside Atlanta.

His wife, Kay, said the cause was complications of dementia. A geriatric psychiatrist who had treated Mr. Morris said he believed his condition was related to football contact. Kay Morris said that her husband first displayed symptoms in his mid-50s and that he had spent the last four years at a nursing facility, where he died.

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Known as the Brahma Bull for his bruising play as an all-American at Georgia Tech and as an 11-year professional, Mr. Morris was named to the NFL’s all-decade team for the 1960s.

His signature moment came on Dec. 29, 1963, when the Bears played the Giants for the league championship. The temperature was about 10 degrees at kickoff, but nearly 46,000 fans jammed Wrigley Field.

The Bears had allowed a little more than 10 points a game in the regular season, but Tittle had thrown a league-leading 36 touchdown passes.

Mr. Morris was an outside linebacker in a defense that also hadfellow All-Pro linebackers Bill George and Joe Fortunato, Doug Atkins at end, and Richie Petitbon and Roosevelt Taylor in the secondary.

The Giants were leading, 7-0, in the first quarter when Mr. Morris intercepted a screen pass by Tittle and ran it back 61 yards to the Giants’ 6, leading to a touchdown.

“I was so tired I knew I was going to get caught,’’ the 6-foot-2, 226-pound Mr. Morris said after the game.

His teammate Johnny Morris, a leading receiver for the Bears, recalled in an interview Sunday how Mr. Morris ‘‘had pretty good speed for a linebacker’’ and ‘‘was as effective against the pass as the run.’’

Larry Morris had plenty of energy left after his long run.

In the second quarter, with the Giants leading 10-7, he downed Tittle as he delivered a pass.Mr. Morris’s helmet struck Tittle’s left knee, and he landed on it awkwardly, sidelining the quarterback for the rest of the half with damaged ligaments.

Tittle returned but had difficulty setting up and threw five interceptions in the Bears’ 14-10 victory.

Larry Cleo Morris was born in Atlanta. He played on two unbeaten teams at Georgia Tech.

Mr. Morris was a first-round draft pick of the Los Angeles Rams in 1955. He played three seasons for the Rams, seven for the Bears, and a final season for the Atlanta Falcons. He was elected to the College Football Hall of Fame in 1992.

After retiring from football, Mr. Morris was a real estate ­developer in the Atlanta area.

But his wife said that much of the family’s financial resources were depleted by his poor business decisions that appear to have been related to the early stages of his dementia.

Mr. Morris’s family provided his brain to a center at Boston University, where research is conducted on the brains of former football players and others who suffered head trauma to determine its links to long-term degenerative brain disease.

Appearing in September 2007 before a US Senate committee studying disability issues facing retired players, Daryl Johnston, the former Dallas Cowboys fullback and football broadcaster, said Mr. Morris had played through four concussions.

The Morris family has received assistance from an NFL players’ union fund that provides up to $88,000 a year for the care of retired players with dementia.

In addition to his wife, Mr. Morris leaves his sons Britt, Chris, and Shan; his daughter, Kayanne Staub; and 12 grandchildren.

In reflecting on Larry Morris’s career, Johnny Morris said that although he had ‘‘an easygoing personality’’ he was ‘‘a great player in a violent game.’’

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