Liam Sullivan, a longtime stage, screen and television actor, died April 19 of a heart attack in Los Angeles. He was 74.Sullivan’s Broadway career included “The Constant Wife,” “Merchant of Venice” and the recent Mike Nichols production of “The Little Foxes.” He also appeared off-Broadway in “Anna K.” TV credits included “Star Trek,” “Twilight Zone,” “Dragnet,” “Hawaii Five-O,” “Dallas” and “L.A. Law.” In the months prior to his death, Sullivan had signed publishing contracts on two books. He is survived by a brother, a sister, three nieces and five nephews. Memorial services will be held at 2 p.m. on May 17 at the Church of Religious Science, 260 Pass Ave., Burbank. Donations in Sullivan’s name may be made to the Actors’ Fund of America.