- Armstrong committed suicide by gunshot, some sources claim after building an addiction to painkillers for a terrible work-related injury he sustained.
- 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.
- Brother-in-law of casting director Tom Jennings.
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