WARNING: This post includes details around Robin Williams’ death.

Robin Williams died of asphyxia due to hanging, the Marin County Sheriff’s office said Tuesday.

Police said he was last seen by his wife at 10:30 p.m. Sunday night and was found by his assistant on Monday morning with a belt around his neck, slightly suspended in a seated position.

He also appeared to have cut his wrists, and a small pocket knife was found near his body.

Police said there were no injuries that indicated a struggle or physical altercation.

Toxicology test results will take two to six weeks, and police called the case an “active investigation.”