James Henrikson was arrested on federal firearms charges Saturday by agents from Homeland Security Investigations and the Bismarck/Mandan Metro Area Narcotics Task Force.
Henrikson is being charged with illegal possession of firearms by a convicted felon. He is also a person of interest in the December murder of Douglas Carlile.
Henrikson was a business associate of Carlile, who was murdered last month in his South Hill home.
Detectives discovered Carlile, one of four owners in Kingdom Dynamics Enterprises, was trying to buy Henrikson out of his share of 640 acres of North Dakota land they owned mineral rights with plans to drill for oil.
Those attempts to buy Henrikson out were rebuffed, while Henrikson, according to court documents, allegedly attempted to buy Carlile out in order to attract an investor who refused to put money into Kingdom Dynamics Enterprises as long as Carlile was involved.
The tensions between the two were so high, a witness told detectives someone has been practicing writing Carlile's signature inside Henrikson's home and confirmed he overheard Henrikson threatening to kill Carlile and his family.
Henrikson, however, told detectives he never threatened his business partner and is not responsible for his murder.
Timothy Suckow was arrested earlier this week for the murder of Carlile. Detectives believe Henrickson or another business associate of Carlile may have hired Suckow to carry out the murder.
Suckow left a trail of evidence leading police to his Spokane Valley home. A van seen leaving the scene of Carlile's home directly after the murder was found at Suckow's place of work and, detectives say, a glove found in the back yard of Carlile's home has DNA evidence matching Suckow.