Briefly a leading man in the 1960's, formerly trained in drama at the Pasadena Playhouse. 'Discovered' by actress Gloria Henry, while working for her as a landscape gardener. Signed by Columbia and cast in the titular role of Jason and the Argonauts (1963). Thereafter, subsided back into supporting roles.
Armstrong committed suicide by gunshot, some sources claim after building an addiction to painkillers for a terrible work-related injury he sustained, other sources claim that he was HIV positive and suffering from AIDS.