Michael K. Williams, an actor best known for his roles on ‘The Wire’ and ‘Boardwalk Empire’ was dead in his Brooklyn apartment Monday afternoon. He was 54 years old.

The investigation is ongoing.

“It is with deep sorrow that the family announces the passing of Emmy nominated actor Michael Kenneth Williams. They ask for your privacy while grieving this unsurmountable loss,” his long-time rep Marianna Shafran of Shafran PR told The Hollywood Reporter.

Williams, a Brooklyn native, most recently appeared in HBO’s “Lovecraft Country” and the series “F Is for Family.”

He became an almost iconic figure for many thanks to his role in “The Wire” as Omar Little, a shotgun-wielding character who made his living robbing drug dealers. He followed that up as a mobster in the HBO Prohibition-era mob drama “Boardwalk Empire,” and most recently earned an Emmy nomination for another series on the pay network, the macabre “Lovecraft Country.”

Williams was next slated to co-star in Sony’s George Foreman biopic from George Tillman Jr., who was set to direct.

Williams amassed a number of accolades during his storied career, including five Emmy nominations. His first was in 2015 for his role in “Bessie” and another followed two years later for his part in “The Night Of.”

He was also the winner of a SAG Award for best ensemble with the cast of “Boardwalk Empire.”

The tributes poured in from all aspects of the entertainment industry. Director Spike Lee paid tribute to Williams on Instagram.

“Whew Lawd,Dis Is A Tough Day-1st We Lose The Great French Actor JEAN PAUL BELMONDO And Now My Brother MICHAEL K. WILLIAMS,” Lee wrote on Instagram. “Our Brother Passed Away Today In His Home,Da People’s Republic Of Brooklyn. I’m Shook. Drinking A Bottle Of Italian Red Wine-Brunello Di Montalcino By Myself. Our Greats Are Leaving Us Left And Right. GOD BLESS.”

Director James Gunn posted on Twitter, calling Williams one of the most talented actors around. “Michael K. Williams, in addition to being one of the most talented actors around, was also one of the kindest, sweetest, most gentle souls I’ve ever met,” Gunn wrote. “This is heartbreaking. My thoughts are with all those who loved him.”

Additionally, Kerry Washington posted Williams to her social media feeds and spoke of the late star’s beauty. “So heartbroken. @bkbmg thank you for the beauty and joy you brought to the world. Sending love and prayers to your friends, family and everyone who adored you me included. We adore you, Sir.”

Michael K. Williams attends the Los Angeles Premiere of MGM’s “Respect” at Regency Village Theatre on August 08, 2021 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)