Vance Boelter, 57, has been charged in the shootings of two Minnesota lawmakers and their spouses. The Hennepin County Attorney said Monday that her office intends to pursue first-degree murder charges against him as well.

Authorities arrested and charged Vance Boelter on Sunday night after he allegedly shot and killed House Democratic leader Melissa Hortman and her husband in their Brooklyn Park home and shot and seriously injured state Sen. John Hoffman and his wife in their home in Champlin.

Surveillance footage captured an attempted murder, according to charges unsealed Sunday: A man wearing a mask, a blue shirt and police-style tactical vest with a badge knocked on a door in Champlin and announced himself as a police officer. He then entered the house and shot Minnesota Sen. John Hoffman and his wife.

After what officials say was the largest manhunt in state history, Boelter was taken into custody Sunday night. He's facing charges of second-degree murder and second-degree attempted murder, but KARE 11's Lou Raguse says those charges will likely be upgraded to first-degree by a grand jury.

The Hennepin County Attorney’s Office unsealed the criminal complaint charging Vance Boelter with two counts of second-degree murder and two counts of second-degree attempted murder.

Federal prosecutors revealed in a six-count complaint that Vance Boelter has been charged with murder, stalking, and firearms violations. The Acting U.S. Attorney for the District of Minnesota, Joe Thompson, said on Monday during a press conference that “It is no exaggeration to say that his crimes are the stuff of nightmares.”