Angus Cloud, the actor best known for playing the drug dealer Fezco “Fez” O’Neill on HBO’s “Euphoria,” died Monday in Oakland, Calif. He was 25.

The Oakland Fire Dept. said it responded to a medical emergency at approximately 11:30 a.m., and the patient was “already deceased.” The cause of death was unknown, the fire department said. The Oakland Police Dept. confirmed that it remains an “active death investigation.”

“It is with the heaviest heart that we had to say goodbye to an incredible human today,” Cloud’s family said in a statement. “As an artist, a friend, a brother and a son, Angus was special to all of us in so many ways. Last week he buried his father and intensely struggled with this loss. The only comfort we have is knowing Angus is now reunited with his dad, who was his best friend. Angus was open about...