Biography: Frederic Fenimore Forrest, Jr. (December 23, 1936 - June 23, 2023) was an American actor. Notable film roles include The Conversation, Valley Girl ,Promise Him Anything (TV), One from the Heart, The Stone Boy, The Missouri Breaks, The Deliberate Stranger (TV), and horror maestro Dario Argento's first American film Trauma. On television, he played Captain Richard Jenko on the first season of the Fox Television series 21 Jump Street, in 1987. Forrest was subsequently replaced by actor Steven Williams, who played Captain Adam Fuller for the remainder of the series. ​From Wikipedia, the free encyclopedia.