A man suspected of killing four people who worked at a business that managed the North Dakota mobile home park where he lived was due in court Friday, where he could be formally charged.

Chad Isaak, a 44-year-old chiropractor with a military background, was expected to appear in Morton County court a day after police arrested him in a mystery that has gripped the area since authorities found the bodies Monday morning at RJR Maintenance and Management in Mandan. Police Chief Jason Ziegler said authorities do not yet have a motive, but that Isaak lived at a mobile home park in Washburn, 35 miles (56 kilometers) from Mandan, that was managed by RJR.

Police say the victims were RJR co-owner Robert Fakler, 52; employee Adam Fuehrer, 42; and married co-workers Lois Cobb, 45, and William Cobb, 50. Ziegler said the victims were shot, stabbed or both.

The owner of the mobile home park, Rolf Eggers, said he never met Isaak and never heard of any problems with him. Eggers, a Bismarck resident who spends his winters in Florida, said he talked to Falker several times a week and Isaak never came up.

“He was a non-issue,” Eggers said. “He never attracted any attention.”

Isaak was being held on suspicion of felony murder. It wasn’t immediately clear whether he had an attorney who could comment on the allegations. Felony murder carries a maximum punishment of life in prison without parole. North Dakota does not have the death penalty.

In this Wednesday, April 3, 2019 photo, state and local police search a field in Manton, N.D., about half a mile from a business where an owner and three employees were found dead. (AP Photo/ Blake Nicholson)
In this Wednesday, April 3, 2019 photo, state and local police search a field in Manton, N.D., about half a mile from a business where an owner and three employees were found dead. (AP Photo/ Blake Nicholson)

Records show Isaak has a chiropractic business. A 1995 marriage announcement said Isaak was an assistant lab technician in the U.S. Navy serving at Pearl Harbor. Isaak received his chiropractic license in 2006, records show. Isaak has no criminal history immediately evident in state or federal court in North Dakota.

Until Isaak’s arrest, police had released little information about their investigation. Homicides are unusual in Mandan, a town of about 22,000 just across the Missouri River from the state capital of Bismarck that hadn’t had a slaying since 2016 — and had only three in the past six years.

“It’s been a difficult week for everyone involved,” Mayor Tim Helbling said.

Mandan Police Chief Jason Ziegler announces an arrest in a quadruple homicide at a press conference Thursday night, April 4, 2019, in Mandan, N. (56 kilometers) north of Mandan. (Tom Stromme/The Bismarck Tribune via AP)
Mandan Police Chief Jason Ziegler announces an arrest in a quadruple homicide at a press conference Thursday night, April 4, 2019, in Mandan, N. (56 kilometers) north of Mandan. (Tom Stromme/The Bismarck Tribune via AP)

Ziegler said police are not looking for anyone else and were focusing on “putting everything together so we can get prosecution on this and bring (the suspect) to justice.” Authorities shut down a tip line they had set up for the investigation.

A memorial service for the victims is planned for Tuesday at Bismarck Community Church, according to Eastgate Funeral and Cremation Service.

Family and friends console each other at the scene near the south side of the RJR Maintenance and Management building in Mandan, N. (Mike McCleary/The Bismarck Tribune via AP)
Family and friends console each other at the scene near the south side of the RJR Maintenance and Management building in Mandan, N. (Mike McCleary/The Bismarck Tribune via AP)

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