- Killed in hit-and-run accident
- In Wild in the Streets (1968), his character Billy Cage was asked how long he thinks he is going to live and he replies "30, man." Coughlin was later killed in a hit-and-run accident on January 19, 1976, only five weeks after his 30th birthday.
- His handicap limp was incorporated into the script of his memorable childhood role of T.R. Ryan on TV's "Mama".
- He died from multiple injuries from a hit and run accident in Los Angeles.
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