NFL Legend Tony Dorsett Diagnosed with CTE

The former running back's doctors say his brain tested positive for the degenerative condition.
2:15 | 11/07/13

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Transcript for NFL Legend Tony Dorsett Diagnosed with CTE
Now, the latest bombshell on head injuries in the nfl. One of the greatest running backs of all-time has revealed a new and shocking diagnosis. Doctors told tony dorsett that his brain has tested positive for a condition known as cte. He went to the hall of fame but evading the best tacklers in the business. But these days, he gets lost driving his daughters to soccer games. Tony dorsett, fresh off a brain scan. Doctors at ucla, fear for his life. Tony dorsett, speaking out on being diagnosed with chronic encephalitis. Glad to see tony dorsett get up and walk off the field. Reporter: He told "outside the lines" he doesn't know how many concussions he suffered during his career in the nfl. But the worst was one this violent hit in a cowboys/eagles game. It reminded me of a mack truck, hitting a volkswagen. I mean, he just blew me up. They call that a knockout. Reporter: Today, he faces the consequences of those hits, including depression, mood swings and memory loss. My memory -- it's getting worse and worse as the days go by. My short temperedness, it gets worse. Reporter: Dorsett says he's prone to outbursts at his wife and daughters. It's painful, for my daught daughters to say they're scared of me. Reporter: Dorsett said he even thought about suicide. I mean, I'm too smart of a person, I'd like to think, to take my life. But it's crossing my mind. Reporter: Dorsett is 1 of 4,500 playoffs in a lawsuit against the nfl. The nfl has declined to comment. But it has an asserted that playing football causes cte or other brain damages. It's heartbreaking to hear that. John, thanks. Now, we move to the latest on kennedy cousin and convicted murderer, michael skakel.

This transcript has been automatically generated and may not be 100% accurate.

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