Accused Minnesota assassin Vance Boelter's alleged plan to kill more politicians on his target list was foiled by a police sergeant's proactive hunch.

Authorities detained the wife of 57-year-old Vance Boelter, the suspect accused in the deadly shooting of a Minnesota state lawmaker and her husband early Saturday morning.

Vance Boelter, 57, was arrested late Sunday night after what law enforcement officials said was the largest manhunt in Minnesota's history.

In a politically motivated attack, two Minnesota lawmakers were shot in their homes early Saturday. Former House Speaker Melissa Hortman was killed, while State Senator John Hoffman was wounded. Authorities are conducting a statewide manhunt for the suspect,