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 Boelter, 57, now faces both federal and state charges in connection with the killings of Melissa Hortman and her husband, Mark.

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.