Paul Regina

Paul Joseph Regina Jr. (October 25, 1956 – January 31, 2006) was an American actor and occasional screenwriter. He is best known for his role as Cliff Waters in the sitcom Brothers (1984–1989), as well as his roles as Felix Echeverria in the legal drama L.A. Law (1988–1992) and Frank Nitti in The Untouchables (1993–1994).

Law & Order · S10, E21

Narcosis

When an Asian-American stripper is found strangled, Detectives Briscoe (Jerry Orbach) and Green (Jesse L. Martin) discover that the victim was also operating a brothel that forced illegal Chinese immigrant women into sex slaves -- and they are further saddened to see two fellow detectives (guest stars Paul Regina and Mark Giordano) who were coerced into aiding her. As their trail narrows, they venture into cyberspace to check out an unlikely suspect - a phantom computer hacker known as "Hotrod." Sam Waterston, Angie Harmon, Steven Hill and S. Epatha Merkerson also star.
Hunter · S6, E13

Son and Heir

Hunter and McCall investigate a mobster's son who kills an undercover officer, unaware the cop is his half-brother.