What mystery film by Robert Altman included a performance by a "One Life To Live" star?
Ryan Phillippe:  After appearing as Billy Douglas on the soap opera "One Life to Live", he came to fame in the late 1990s with starring roles in a string of films, including "I Know What You Did Last Summer", "Cruel Intentions", and "54". Gosford Park: Gosford Park is a 2001 British mystery film directed by Robert Altman and written by Julian Fellowes.
Gosford Park