Cathy Tyson. Actress: Mona Lisa. Cathy Tyson's father is a barrister from Trinidad and her mother is an English social worker. She dropped out of college at age 17 to pursue acting at Liverpool's Everyman's Theater. After a 1984 production of "The Blitz Show", she won admission to the Royal Shakespeare Company. Her film debut was as an elegant prostitute in Mona Lisa (1986).