Among his numerous film and television roles, such as in the television series "The Storefront Lawyers" (1970–1971), Foxworth is best known for his stints on "Falcon Crest" (he played Jane Wyman's long-suffering nephew, Chase Gioberti, from 1981–1987) and "Six Feet Under" (he played Bernard Chenowith from 2001–2003), as well as a starring role in Gene Roddenberry's 1974 movie "The Questor Tapes". He also appeared in the episode "All My Tomorrows" of the NBC romantic anthology series "Love Story" in 1973 and in the episode "The Mask of Adonis" from the 1977 NBC science fiction-horror anthology series "Quinn Martin's Tales of the Unexpected" (known in the United Kingdom as "Twist in the Tale"). He had a guest-starring role on the seventh season of "The West Wing" and a guest spot on "Law & Order".