Mandan Police, along with the assistance of the North Dakota Bureau of Criminal Investigation and the McLean County Sheriff’s Office is following up on a lead that led investigators to Washburn.

A person of interest related to the RJR quadruple homicide has been detained. This is an ongoing investigation.

We will continue to update with further developments as this progresses into the evening.

Arrest made in homicide case, 44-year-old Chad Isaac

More on “person of interest” being detained by law enforcement

Memorial Service open to the public

Timeline: A look at how the week has unfolded

More information on the Tip Hotline

Cobb daughters speak out 

Questions remain on Day 3 of the investigation

More on the business reopening

 Victims identified

More on Day 2 of the investigation

Mandan residents discuss heartbreak of the last 24-hours

Donations pour in for RJR families

Watch the Press Conference

First homicide in Mandan since 2016

More stories on the Mandan homicides