Question: The American television series Delvecchio starred what actor, known for playing Alex Rieger on Taxi, as the title character?

Context paragraphs:
Traci Lind: Traci Lind (born Traci Lin Wemes April 1, 1968 in Louisville, Kentucky) is an American film actress who is known for playing Alex Young in "Fright Night Part 2", Christie Langford in "Class of 1999" and Missy McCloud in "My Boyfriend's Back".  She also starred in "The Road to Wellville" and "The End of Violence".  She was billed in "Fright Night Part 2" and "Spellcaster" as Traci Lin.  She began modeling at age 13 after being discovered by Elite's head, John Casablancas.

Saskia Wickham: Saskia Wickham (born 14 January 1967) is an English actress best known for playing Alex Wilton in the drama series Boon and Dr. Erica Matthews in the ITV television drama series "Peak Practice" between 1996 and 1998.

Mekenna Melvin: Mekenna Melvin (born January 23, 1985) is an American actress best known for playing Alex McHugh in "Chuck", Angela in "Three Rivers" and Stefanie Fife in "Lie to Me".  She also co-created and starred as Amber Hannold in "Amber Lake", an independent film released in 2010.

Judd Hirsch: Judd Seymore Hirsch (born March 15, 1935) is an American actor known for playing Alex Rieger on the television comedy series "Taxi" (1978–1983), John Lacey on the NBC series "Dear John" (1988–1992), and Alan Eppes on the CBS series "NUMB3RS" (2005–2010).  He is also well known for his career in theatre and for his roles in films such as "Ordinary People" (1980), "Running on Empty" (1988), "Independence Day" (1996), and "A Beautiful Mind" (2001).

Josh Brown (actor): Joshua Brown (born 19 February 1990 , Leeds) is a British actor.  He is best known for playing Alex Pickering in the long-running BBC school drama, "Grange Hill" and the main role Matt in the "Being Human" spin off "Becoming Human".  He has also appeared in another long-running series, "Casualty".  He guest starred in an episode of "Holby City" as a character called Frankie Moores.  Joshua has filmed episodes for series 5 of Waterloo Road.

Chris D'Elia: Chris D'Elia (born March 29, 1980) is an American stand-up comedian, actor, writer and podcast host.  He is known for playing Alex Miller on the NBC sitcom "Whitney" and for the role of Danny Burton on the sitcom "Undateable", also on NBC.

Sue Price: Sue Price (born 29 March 1965 in Mount Prospect, Illinois, United States) is an American professional bodybuilder and actress, probably best known for playing Alex Sinclair in the "Nemesis" film series, a character inspired by the movie's original hero, Alex Rayne, a member of the LAPD.

Delvecchio (TV series): Delvecchio is an American television series that aired Sundays at 10:00 pm (EST) on CBS during the 1976-77 season.  It starred Judd Hirsch as the title character, Dominick Delvecchio, an Italian-American detective who worked for the LAPD and also studied to become a lawyer.

Nicholas Gonzalez: Nicholas Edward Gonzalez (born January 3, 1976) is an American actor, best known for playing Alex Santiago in the television series "Resurrection Blvd."

Sam Jackson (actor): Sam Benjamin Jackson (born 23 September 1993) is an English actor from Wetherby, West Yorkshire, best known for playing Alex Henley in the sixth series of the E4 teen drama "Skins".

Supporting paragraphs: Delvecchio (TV series) Judd Hirsch
Answer: Judd Hirsch