Vance Boelter, the suspected assassin accused of gunning down two Minnesota lawmakers and their spouses, killing one couple, is expected to plead not guilty during his arraignment in federal court

He’s charged in the slaying of Rep. Melissa Hortman and her husband, and the shooting of Sen. John Hoffman and his wife.

MINNEAPOLIS (AP) — The man charged with killing the top Democrat in the Minnesota House and her husband, and wounding a state senator and his wife, is expected to plead not guilty when he’s arraigned in federal court on Thursday, his attorney said.