GRAND FORKS, N.D. (AP) — The ex-roommate of a North Dakota man accused of making synthetic drugs that killed two people has pleaded guilty to conspiracy.

The Grand Forks Herald reports that 24-year-old William Fox, of Grand Forks, admitted Monday to distributing the synthetic hallucinogens allegedly made by his roommate, Andrew Spofford. Fox faces up to 30 years in prison when he is sentenced Nov. 20.

The 22-year-old Spofford faces a similar drug conspiracy charge and remains in federal custody. He has not yet entered a plea. Three others also face state or federal charges in the case.

Police say 18-year-old Christian Bjerk, of Grand Forks, and 17-year-old Elijah Stai, of Park Rapids, Minn., died of apparent drug overdoses from the hallucinogens. Authorities say at least five others were hospitalized with overdoses.