MANDAN, N.D. — A suspect has been arrested on murder charges in connection to the four deaths at RJR Management & Maintenance.

Chad Isaak, 44, of Washburn, was arrested during a traffic stop Thursday afternoon, April 4, in connection to the deaths, the Mandan Police Department announced at an evening press conference. Isaak lived in a mobile home park managed by RJR Maintenance and Management

Many hours of video surveillance were reviewed to identify the suspect’s vehicle, leading investigators to Isaak. Evidence in his vehicle gave police probable cause to arrest him, Mandan Police Chief Jason Ziegler said.

A motive is still unknown and a weapon has not been recovered, but Ziegler said victims died from stab wounds and/or gunshot wounds.

Chad Isaak
Chad Isaak

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North Dakota court records do not show a criminal history for Isaak. Ziegler said police are not seeking other suspects.

Mandan police responded to a medical call at RJR Maintenance and Management, owned by Robert and Jackie Fakler, at about 7:30 a.m. Monday. Upon arrival, officers discovered four bodies inside the building.

The North Dakota Bureau of Criminal Investigation and the McLean County Sheriff's Office were following up on a lead in Washburn, 40 miles north of Mandan, police said in an earlier news release.

Bismarck CBS-affiliate KXMB-TV reported receiving phone calls from viewers about a large police presence in Washburn. According to the news station, police could be seen outside of a home at the Northview Mobile Home and RV Park.

Amy Dalrymple of the Bismarck Tribune contributed to this report.