Kelsey Grammer reacts to 'Frasier' co-star John Mahoney's death

Kelsey Grammer is mourning the loss of his TV dad.

The Frasier star provided a brief, but heartfelt response to ET after the death of John Mahoney -- who played Martin Crane on the long-running sitcom -- at age 77.

“He was my father," Grammer, 62, said. "I loved him."

Mahoney's rep confirmed his death to ET on Monday, which happened in Chicago on Sunday "after a short illness." According to multiple reports, he was in hospice care when he died.

Mahoney earned two Emmy nominations for his role on Frasier, where his chemistry and bond with Grammer, as well as his other TV son, David Hyde Pierce's character, Niles, was unmistakable.

john mahoney kelsey grammer frasier
NBC/NBCU Photo Bank via Getty Images

Mahoney also starred in such films as Say Anything and Barton Fink. Recently, he also had a recurring role on Hot in Cleveland, where he played a love interest of Betty White.

The actor was born in Lancashire, England, becoming a U.S. citizen in 1959. Before taking up theater and acting in 1977, he served in the U.S. military and worked as an English teacher at Western Illinois University. Mahoney was unmarried and never had children.

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Sitting in his character's favorite chair, actor John Mahoney flashes a dastardly smile on the Fraiser set during a break in filming at Paramount Studios, Tuesday morning in Hollywood. Mahoney, who plays Frasier's dad on the TV show, is a central figure in a new gay movie set in West Hollywood. He's one of two well�known TV stars in the film, and he was interviewed at Paramount Studios, where he's been working on the show for the new season. (Photo by Richard Hartog/Los Angeles Times via Getty Images)
FRASIER -- 'Junior Agent' Episode 10 -- Aired 10/27/01 -- Pictured: (l-r) John Mahoney as Martin Crane, Jane Leeves as Daphne Moon, David Hyde Pierce as Dr. Niles Crane (Photo by NBC/NBCU Photo Bank via Getty Images)
THE 50TH ANNUAL PRIMETIME EMMY AWARDS -- Pictured: John Mahoney arrives at the 50th Annual Primetime Emmy Awards held at the Shrine Auditorium in Los Angeles, CA on September 13, 1998 -- (Photo by: Margaret C. Norton/NBC/NBCU Photo Bank via Getty Images)
HOLLYWOOD, CA - MARCH 3: Actors David Hyde Pierce, John Mahoney and Kelsey Grammer attend the Museum of Television Festival-An Evening With 'Frasier' on March 3, 1995 at the Director's Guild Theater in Hollywood, California. (Photo by Ron Davis/Getty Images)
385849 08: Actors (l-r): John Mahoney as Martin Crane, David Hyde Pierce as Niles Crane and Jane Leeves as Daphne Moon star in NBC''s television comedy series 'Frasier.' Episode: 'Mary Christmas' - Martin, Niles and Daphne open Christmas presents as they watch Frasier host the holiday parade. (Photo by Gale Adler/Paramount)
397187 17: Actor John Mahoney arrives for a celebration in honor of 200 episodes of the popular television series 'Fraiser' November 13, 2001 at the Park Plaza Hotel in Los Angeles, CA. (Photo by Vince Bucci/Getty Images)
FRASIER -- 'The Two Hundredth' Episode 8 -- Aired 11/13/01 --Pictured: (l-r) David Hyde Pierce as Dr. Niles Crane, Peri Gilpin as Roz Doyle, Tom McGowanas Kenny Daly, Dan Butler as Bob 'Bulldog' Briscoe, Adam Arkin as Tom, John Mahoney as Martin Crane, Kelsey Grammer as Dr. Frasier Crane (Photo by NBC/NBCU Photo Bank via Getty Images)
370100 06: John Mahoney as Jack in Sony Pictures Classics romantic comedy 'The Broken Hearts Club.' (Photo by Mimi Carven/Online USA)
FRASIER -- 'The Fight Before Christmas' Episode 711 -- Pictured: (l-r) Moose as Eddie, John Mahoney as Martin Crane -- (Photo by: Gale M. Adler/NBC/NBCU Photo Bank via Getty Images)
FRASIER -- Pictured: John Mahoney as Martin Crane (Photo by David Rose/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES - SEPTEMBER 21: Actor John Mahoney attends the 55th Annual Primetime Emmy Awards at the Shrine Auditorium September 21, 2003 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
FRASIER -- 'The Proposal' Episode 15 -- Aired 02/05/02 -- Pictured: (l-r) Kelsey Grammer as Dr. Frasier Crane, John Mahoney as Martin Crane (Photo by NBC/NBCU Photo Bank via Getty Images)
401912 13: Actors David Hyde Pierce (L) and John Mahoney attend 'A Night Sardi's' at the 10th Annual Gala Fundraiser to benefit the Alzheimer's Assoicaition March 6, 2002 in Beverly Hills, CA. (Photo by Frederick M. Brown/Getty Images)
NEW YORK - JUNE 10: Actor John Mahoney attends the 61st Annual Tony Awards at Radio City Music Hall on June 10, 2007 in New York City. (Photo by Peter Kramer/Getty Images)
FRASIER -- Season 7 -- Pictured: (l-r) John Mahoney as Martin Crane, David Hyde Pierce as Dr. Niles Crane, Kelsey Grammer as Dr. Frasier Crane, Moose as Eddie, Peri Gilpin as Roz Doyle, Jane Leeves as Daphne Moon (Photo by Chris Haston/NBC/NBCU Photo Bank via Getty Images)
FRASIER -- Season 6 -- Pictured: (l-r) Peri Gilpin as Roz Doyle, David Hyde Pierce as Dr. Niles Crane, Kelsey Grammer as Dr. Frasier Crane, John Mahoney as Martin Crane, Moose as Eddie, Jane Leeves as Daphne Moon, Dan Butler as Bob 'Bulldog' Briscoe (Photo by Bill Reitzel/NBC/NBCU Photo Bank via Getty Images)
Actor John Mahoney attends NBC TV Winter TCA Press Tour on January 8, 1994 at the Ritz Carlton Hotel in Pasadena, California. (Photo by Ron Galella, Ltd./WireImage)
LOS ANGELES, CA - JULY 26: Warner Bros. Alan Horn (L) and actor John Mahoney arrive at the premiere of Warner Bros. 'Flipped' at the Cinerama Dome Theater on July 26, 2010 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
Actor John Mahoney attends the 'Flipped' Los Angeles Premiere at ArcLight Cinemas Cinerama Dome on July 26, 2010 in Hollywood, California.
INDIANAPOLIS - AUGUST 02: John Mahoney during the Q&A session following the screening of 'Flipped' at the Hilbert Circle Theatre on August 2, 2010 in Indianapolis, Indiana. (Photo by Joey Foley/Getty Images)
Actors Jane Krakowski (R) and John Mahoney perform during the 61st Annual Tony Awards in New York June 10, 2007. REUTERS/Gary Hershorn (UNITED STATES)
Cast members Ashley Taylor, Stefanie Scott, Madeline Carroll, John Mahoney and Penelope Ann Miller (from L-R) pose for photographers at the premiere of the film "Flipped" in Los Angeles July 26, 2010. REUTERS/Phil McCarten (UNITED STATES - Tags: ENTERTAINMENT)
FRASIER -- 'Death and the Dog' Episode 12 -- Pictured: (l-r) John Mahoney as Martin Crane, Moose as Eddie (Photo by Gale M. Adler/NBC/NBCU Photo Bank via Getty Images)
FRASIER -- Season 1 -- Pictured: (Back, l-r) David Hyde Pierce as Doctor Niles Crane, Peri Gilpin as Roz Doyle, John Mahoney as Martin Crane, Jane Leeves as Daphne Moon, (Front, seated) Kelsey Grammer as Doctor Frasier Crane (Photo by David Rose/NBC/NBCU Photo Bank via Getty Images)
FRASIER -- Season 7 -- Pictured: (l-r) Peri Gilpin as Roz Doyle, John Mahoney as Martin Crane, Kelsey Grammer as Doctor Frasier Crane, Moose as Eddie, David Hyde Pierce as Doctor Niles Crane, Jane Leeves as Daphne Moon (Photo by Chris Haston/NBC/NBCU Photo Bank via Getty Images)
John Mahoney during 55th Annual Primetime Emmy Awards - Governors Ball at The Shrine Auditorium in Los Angeles, California, United States. (Photo by Chris Weeks/FilmMagic)
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