The Wire actor Michael K Williams has died at the age of 54, police in New York say.
Williams, who was known for his role as Omar Little in the hit TV series, was found by police at his Brooklyn home at around 2pm on Monday.
Officials say an investigation is ongoing.
Williams was nominated at this year's Emmy awards for his part in HBO's Lovecraft Country.
The actor also won fans for his role as Chalky White in Boardwalk Empire.
The PA news agency said his death was confirmed by police sources in New York.
"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 representative Marianna Shafran of Shafran PR told The Hollywood Reporter.
More from Ents & Arts
Sarah Harding: Cheryl pays tribute to 'stunning, unique' Girls Aloud bandmate
Sarah Harding: The Girls Aloud singer's life in pictures – from Pop Stars: The Rivals to chart-topping star
Sarah Harding 'fought incredibly hard for 15 months' and was 'really resilient', says consultant who treated her breast cancer
Wiley charged with assault and burglary over London break-in allegations
Phil Jerrod: Tributes to 'the loveliest man' after comedian and Mock the Week writer's death, aged 42
The force is strong with this one: Star Wars actor Mark Hamill goes viral… for tweeting his own name
Filmmaker James Gunn has paid tribute to Williams, describing him as among the "most gentle souls I've ever met".
He tweeted: "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. This is heartbreaking. My thoughts are with all those who loved him."