- 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 Miami Vice (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.
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