Alain Delon, noted French actor. NYT (gift link).
Other credits include “Someone Is Bleeding” (aka “Icy Breasts”, based on a Richard Matheson novel), “The Assassination of Trotsky” (apparently, he was the assassin to Richard Burton’s (!) Trotsky), and…
…he didn’t have much of a US career, but he did play “Joe Patroni”‘s co-pilot and procurer in “The Concorde…Airport ’79“.
John Aprea, actor. Other credits include a movie that does not exist and is clearly a copyright trap by IMDB, “Renegade”, “Lt. Vince Novelli” on “Matt Houston”, “Mrs. Columbo” (but not “Columbo”), “The F.B.I.”, “The Seven-Ups”…
…and yes, he did do a “Mannix” (“Murder Revisited”, season 3, episode 23. IMDB lists him as “Thug (uncredited)”.)