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, and his capture came after he made a big misstep that exposed his whereabouts to an eagle-eyed neighbor,

Vance Luther Boelter, the man suspected of gunning down Minnesota Rep. Melissa Hortman and her husband and shooting state Sen. John Hoffman and his wife, ended Sunday night with his arrest.

Boelter is facing six federal charges, including multiple counts of murder and stalking, opening the possibility of the death penalty or life in prison if he's convicted.