No one will ever know why Dave Duerson, the four-time Pro Bowl safety who played for the 1985 Super Bowl champs, the Chicago Bears, killed himself with a shot to the chest last week, at age 50, leaving behind four children, countless heartbroken fans and many puzzled, worried current and former pro-football players. "I saw him at a 25th anniversary party for our Super Bowl team in October, and he was terrific," says former Bears coach Mike Ditka, who led that '85 team to the title. "I don't understand."

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