An 84-year-old man attacked a woman with a pipe wrench and threatened her with a knife inside a Lino Lakes assisted living facility, prosecutors say.

Donald Thomas Mazur, of Lino Lakes, faces a charge of second-degree assault with a dangerous weapon, according to a complaint filed Wednesday in Anoka County District Court.

According to the complaint, officers responded to an assisted living facility in Lino Lakes on July 28, 2026, after staff reported an assault in progress. Staff told officers that Mazur had a knife and was attacking another resident. Officers found Mazur seated on a couch in a resident’s room, holding a steak knife. An adult female victim was bleeding from a head wound and receiving medical aid from staff.