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A 30-year-old Billings man shot and killed his friend and survived a self-inflicted gunshot wound after the two struggled to cope with the effects of a psilocybin mushroom trip in November, according to charges.

William Eugene Kenney pleaded not guilty to negligent homicide with a weapons enhancement in Yellowstone County District Court on Friday. He’s accused of killing 25-year-old man, who was identified as John Smathers by the Yellowstone County Sheriff’s Office.

Kenney told a Billings Police Department detective Nov. 21, 2018, that he and his friend had gotten high on mushrooms the night before, that they “got kinda crazy” and “both thought (they) were dying,” charges state. Kenney told the detective he remembered shooting Smathers with an AR-15, shooting himself and then passing out, the charges state.

Kenney’s father, whom Kenney lives with at his West End home, had called police after seeing blood in the basement and a man with a head injury whom he believed to be dead.