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RJR Maintenance and Management

Mandan Police Deputy Chief Lori Flaten, left, and other law enforcement personnel stand outside the scene on the south side the RJR Maintenance and Management property at 1106 32nd Ave. S.E. in Mandan on Monday morning. 

MANDAN, N.D. — Authorities arrested a Washburn, North Dakota, chiropractor Thursday in connection with the killings of four people found dead on Monday at a Mandan business.

Mandan Police Chief Jason Ziegler said police arrested Chad Isaak, 44, of Washburn, who lived in a mobile home park managed by RJR Maintenance and Management.

Ziegler said Isaak was arrested without incident on suspicion of four counts of Class AA felony murder in connection with the deaths of RJR co-owner Robert Fakler and employees Adam Fuehrer and William and Lois Cobb.

“The victims suffered stab wounds and/or gunshot wounds,” Ziegler said.

Police identified a suspect vehicle through surveillance video, leading to a traffic stop where McLean County deputies detained Isaak.

Ziegler said evidence in the vehicle and on Isaak provided probable cause for Isaak’s arrest. 

He was being held in the McLean County Jail. It was unclear when formal charges would be filed or Isaak would make a court appearance.

North Dakota court records do not show a criminal history for Isaak.

Ziegler said police are not seeking other suspects. 

Isaak opened Isaak Chiropractic of Washburn on Main Avenue  in 2015, according to a feature story on Isaak in a 2015 supplement to the McLean County Independent. Isaak first opened a practice in Hazen in 2006, the news story said.

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The chief also said a motive is unknown and investigators have not recovered a weapon.

Ziegler said he could not offer a time frame for the homicides as police have not received the medical examiner's report. 

The case is still an active investigation.

Mandan Mayor Tim Helbling thanked emergency responders and community members for their parts in the case and supporting those involved.

“We live in a great community and when adversity strikes, we all come together and that is shown by the support that we have seen in this community all week,” Helbling told reporters.

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(Reach Amy Dalrymple at 701-250-8267 or Amy.Dalrymple@bismarcktribune.com)

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