The New York Medical Examiner has confirmed Michael K. Williams' cause of death.
The NYC Office Chief Medical Examiner confirmed on Friday via Deadline, September 24, that the Boardwalk Empire actor died of “acute intoxication by the combined effects of fentanyl, p-fluorofentanyl, heroin and cocaine.” The manner of death was ruled accidental by the CME.
At the time of Williams' passing a New York Police Department detective told the outlet, that the 54-year-old “was discovered deceased in an apartment located at 440 Kent Avenue today around 1400 hours. It’s an ongoing investigation and the medical examiner will determine the cause of death.”
As OK! previously reported, the NYPD announced that they were opening an investigation into who sold Williams the fatal dose of narcotics after authorities recovered what at the time was to believed to have been heroin-based drugs near the star's body.
Williams was found dead in his Brooklyn penthouse apartment on Monday, September 6.
In a statement to People, his representative stated, "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."
HBO, the network that launched the actor's show The Wire, released a statement at the time of his death. "We are devastated to learn of the passing of Michael Kenneth Williams, a member of the HBO family for more than 20 years. While the world is aware of his immense talents as an artist, we knew Michael as a dear friend who was beloved by all who had the privilege to work with him. We send our deepest condolences to his family for this immeasurable loss."
Warner Bros also released a heartfelt statement on Twitter that read, "Warner Bros. Television mourns the tragic loss of Michael K. Williams, a force of nature on screen, and a kind and gentle soul in life. Our thoughts are with his family, friends, colleagues and fans."