Question: On what TV series did the actor who played Ryan O'Reily on Oz play John Gavin?

Context paragraphs:
Ryan O'Reily: Ryan O'Reily is a main character in the television series "Oz".  He was portrayed by Dean Winters from 1997 to 2003.

Agnes Gavin: Agnes Gavin (1872–1947), was an Australian actor and screenwriter in the silent film era.  She worked in collaboration with her husband John Gavin throughout her career.  She wrote the majority of his films and was arguably the first specialist screenwriter in the history of the Australian film industry.  In newspapers she was advertised as the "well known picture dramatizer" and was praised for creating "cleverly constructed stories".  Many of her films are considered lost.

John Gavin: John Gavin (born Juan Vincent Apablasa; April 8, 1931) is an American film actor who was the United States Ambassador to Mexico from 1981 to 1986 and President of the Screen Actors Guild from 1971 to 1973.  He is best known for his performances in the films "Imitation of Life" (1959), "Spartacus" (1960), "Psycho" (1960), and "Thoroughly Modern Millie" (1967), playing leading roles in a series of films for producer Ross Hunter.

Brent Bailey: Brent Bailey is an American film and television actor, director, producer, and screenwriter born in Tucson, Arizona.  Bailey has appeared in television series such as Criminal Minds, Rizzoli & Isles and Hart of Dixie.  Bailey also played Alex Knightley on the series Emma Approved, which won a Primetime Emmy Award for Outstanding Original Interactive Program in 2015.  It has been announced that he will play John F. Kennedy's speechwriter Ted Sorensen in the feature film LBJ directed by Rob Reiner.

Poetic Justice (Stan Rogers album): Poetic Justice is a compact disc released 19 November 1996.  It contains two radio plays: "Harris and the Mare", based on Stan Rogers' song of the same name, adapted by John Gavin Douglas for the CBC Radio series "Nightfall", and "The Sisters" by Silver Donald Cameron, a play written for "CBC Playhouse", for which Stan wrote and performed the music.

Tobias Beecher: Tobias Beecher is a main character on the television show "Oz", played by Lee Tergesen.  He is one of only nine regular characters to survive the entire run of the show.  The others are Bob Rebadow, Ryan O'Reily, Miguel Alvarez, Arnold "Poet" Jackson, Sister Peter Marie Reimondo, Tim McManus and Dr. Gloria Nathan.

Johnny Gavin (Rescue Me): Johnny Gavin is a fictional character on the FX drama series "Rescue Me".  The character was played by Dean Winters.

Brian Siewert: Brian D. Siewert, alternatively credited with or without his middle initial, is an American public speaker, multiple Emmy-Award winning concert and television composer, producer, musician, arranger and visual artist.  He has worked on "The Guiding Light - CBS" (1996–2009) as Principal Composer/Songwriter, "As the World Turns - CBS" (1995-2010) as Principal Composer/Songwriter and Supervising Music Producer, "General Hospital" - ABC (TV Series), "The Oprah Winfrey Show (TV series)", "The Ellen DeGeneres Show" (2003), "Another World (TV series) - NBC" (1995-1999),"The Tyra Banks Show" Syndicated, "The Dr. Oz Show" Syndicated, "Sunset Beach (TV series) - NBC" (1997-1998), "eXtra (TV series) - Syndicated", "Access Hollywood (TV series) - Syndicated", "Street Smarts", "elimiDATE", "Celebrity Justice", "The Sharon Osbourne Show", and "The Real Gilligan's Island".  Siewert is the recipient of both ASCAP and BMI (Broadcast Music, Inc.) Awards for his work in Film/TV Music.

Cyril O'Reily: Cyril O'Reily is a fictional character, played by American actor Scott William Winters, on the HBO drama "Oz".  He is also mentioned in the companion book "Oz: Behind These Walls: The Journal of Augustus Hill".

Dean Winters: Dean Gerard Winters (born July 20, 1964) is an American actor.  He is known for his role as Ryan O'Reily on the HBO prison drama "Oz", and has also appeared on such television series as "Rescue Me", "30 Rock", and "", as well as the character "Mayhem" in a series of Allstate Insurance commercials.  Winters co-starred with Josh Duhamel in one season of the CBS Network cop drama series "Battle Creek".

Supporting paragraphs: Johnny Gavin (Rescue Me) Dean Winters
Answer: Rescue Me