The man suspected of shooting and killing a Minnesota lawmaker and her husband and shooting and wounding a second lawmaker and his wife is due in court on Monday after he was apprehended overnight.

Vance Boelter, 57, was arrested near his farm in Green Isle, Minnesota, and booked into the Hennepin County Jail at about 1 a.m., according to online records.

He is expected to appear in court Monday afternoon to face two charges of murder and two charges of attempted murder, according to court documents.

Boelter is accused of killing Minnesota state Rep. Melissa Hortman and her husband, Mark, and wounding state Sen. John Hoffman and his wife, Yvette.

Early Saturday morning, the gunman knocked on the Hoffmans' door in Champlin, Minnesota, identified himself as a police officer and then went in the house and shot the couple, according to court documents.

After the Hoffmans were shot, officers proactively went to the home of his fellow lawmaker, former Speaker of the Minnesota House of Representatives Melissa Hortman, in the nearby town of Brooklyn Park.

Around 3:35 a.m., when officers arrived at the Hortmans' house, they saw an SUV "with police-style lights" in the driveway and "immediately saw Defendant, still dressed as a police officer, shoot an adult man ... through the open door of the home," according to court records.

The gunman engaged in a shootout with responders and then fled the scene on foot, authorities said.

The officers who confronted the suspect likely prevented other shootings, according to Drew Evans, superintendent of the Minnesota Bureau of Criminal Apprehension.

A target list was recovered from the suspect's car outside the Hortmans' house with a list of dozens of Minnesota Democrats, including Hoffman, Hortman, Gov. Tim Walz, U.S. Rep. Ilhan Omar, U.S. Sen. Tina Smith and state Attorney General Keith Ellison, according to law enforcement sources familiar with the matter.

The shootings sparked a massive, two-day manhunt that included 20 SWAT teams, helicopters and unmanned aerial vehicles, authorities said.

Boelter was armed when he was taken into custody late Sunday in a rural area, authorities said, but he was taken into custody without incident.

Investigators are looking to see if anyone helped Boelter but are confident he worked alone, Evans said.

A motive remains under investigation.

ABC News' Bill Hutchinson, Leah Sarnoff, Josh Margolin, David Brennan, Jack Moore, Luke Barr and Mike Levine contributed to this report.

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