- Survived by his life partner Tom Nicoll with whom he had lived from 1961 until his death in 2007.
- Dark, dexterous, handsome hero of adventure fantasies, costumers and swashbucklers whose 50s and 60s career was bolstered by battling some of Ray Harryhausen's famous animated creatures.
- Attended Janesville High School in Janesville, Wisconsin, and Beloit College, in Beloit, Wisconsin, where he learned fencing.
- Was a teacher before getting into the acting field.
- Although Andrew Keir played his father in The Pirates of Blood River (1962), Mathews was three months his senior in real life.
- Kerwin has lived in San Francisco since 1970 and manages Pierre Deux, a French country furniture and decorative accessories store.
- Body cremated.
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