- He became friends with John Cassavetes and Peter Falk at the Actors Studio in his native New York City.
- He served in the United States Navy during World War II.
- Made thirteen appearances in the Columbo (1971) series. He is one of a few actors, besides Peter Falk, to play the same character in more than one adventure/episode.
- He was one of 11 children born to Irish immigrant parents.
- Finnegan appeared in five films of director/actor John Cassavetes.
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