Dennis Farina, the former Chicago police officer who went on to portray a detective on "Law & Order," died on Monday at age 69.
The actor began his career in Hollywood after spending 20 years on the law force in Chicago.
Farina's publicist Lori De Waal announced his death, which occurred after the actor suffered a blood clot in his lung in Scottsdale, Arizona, according to Reuters.
Using his experience as an actual law enforcement officer, Farina played the wisecracking detective Joe Fontana on NBC's "Law & Order," among many other television series.
He also appeared in films such as "Get Shorty" alongside John Travolta as well as "Midnight Run" which also starred Robert De Niro, among other movies.
Most recently, Farina appeared on the hit sitcom "New Girl."
The actor leaves behind three sons, six grandchildren and his partner of 35 years, Marianne Cahill, according to Reuters.
Kirstie Alley was among the many celebrities mourning Farina on Tuesday. The actress posted to Twitter: "RIP Dennis Farina… what an awesome actor and person. Love love love"
"RIP Dennis Farina," actor Dean Norris added. "One of the greats. An inspiration to me."
"Extra TV's" Mario Lopez also mourned Farina, writing: "R.I.P. Dennis Farina… Ex Chicago cop, turned actor. Great guy, pleasure to have known him.. #MidnightRun"
"RIP Dennis Farina. Loved him as Ray Bones in 'Get Shorty,'" wrote actor Jay Bilas.
Robin Williams, Seth Green, Rosie O'Donnell and Gary Sinist also mourned the baritone-voiced actor via social media.
Additionally, "Law & Order" creator Dick Wolf expressed his sadness over Farina's death.
"I was stunned and saddened to hear about Dennis' unexpected passing this morning," said the hit show's creator, according to Entertainment Weekly. "The 'Law & Order' family extends sympathy and condolences to his family. He was a great guy."