- Made his professional boxing debut on December 21, 1985, at the Miami Beach Convention Center on 17th Street in South Beach. Diehl knocked out Deboe Bickering in one round.
- Probably most familiar to TV audiences as Det. Larry Zito on the smash hit 1980s cop series Deux flics à Miami (1984) and most recently as the spirit of pioneering GM auto designer Harley Earl in a series of commercials for Buick.
- Took his undefeated boxing record of 3-0 to the Sports Arena in Los Angeles to fight winless Gene Holly 0-6-0. Diehl lost the four-round decision on April 11, 1986, and retired from boxing after the fight.
- Attended St. Xavier High School in Cincinnati, Ohio.
- Filmed scenes for L'oeil du tueur (1987) but they were ultimately deleted by the studio before release. The scenes can be seen on the Arrow Video DVD/BD release as bonus features, including audio commentary by the director, Donald Cammell.
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