Angus Cloud’s Dad Died Of Stage 4 Cancer Before ‘Euphoria’ Star’s Death

It’s becoming more clear why the death of Angus Cloud‘s father hit the actor so fast and hard … his dad was suffering from stage 4 cancer leading up to the actor’s own death.

The late “Euphoria” star’s dad, Conor Hickey, died from fluid buildup around his lungs and heart, with stage 4 cancer in those same organs … this according to his death certificate.

The doc, obtained by TMZ, shows Angus’ dad had stage 4 mesothelioma … which may explain why his sudden passing hit Angus like a ton of bricks.

TMZ broke the story … Angus’ family says he struggled in the wake of his dad’s very quick cancer battle, laying his father to rest in Ireland a week before he died in the family’s Oakland home.

The circumstances of his dad’s death could explain how serious things were for Angus mentally … and it brings some insight into his final days.

Remember … a source close to the family told us Angus had been struggling with thoughts of suicide since returning home from his dad’s funeral … and he was staying in the family home as he tried to work through the grief of losing his father.

As we first reported … Angus’ mom called 911 about a “possible overdose,” claiming her son didn’t have a pulse.

Since Angus’ death, a mural went up down the street from his home … and a candlelight vigil was held at the same spot, which has become the central gathering place for people wanting to pay their respects.