Former Marshall Co. men tied to fatal shooting

Jon McMartin accused of killing roommate Garrett Stephenson

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HOLYOKE, Colo. — Colorado officials are continuing their investigation into the weekend shooting death of a former Marshalltown man; his roommate, formerly of Green Mountain, has been charged with murder.

According to the Holyoke Police Department, at about 4:38 p.m. Saturday, the Phillips County Communications Center received a 911 call stating that there had been a shooting at a Holyoke residence.

The police, along with the Phillips County Sheriff’s Office, were dispatched to the scene, where they found Garrett Stephenson, 33, formerly of Marshalltown, lying outside the residence with a gunshot wound to the chest. Stephenson’s roommate, Jon McMartin, also 33, and formerly of Green Mountain, was outside the residence when authorities arrived.

Officers began first aid until the Holyoke Ambulance arrived. Stephenson was then transported to Melissa Memorial Hospital in Holyoke where he died shortly thereafter.

Officials said upon investigation, it was determined that Stephenson and McMartin had a verbal argument that turned into a physical altercation when McMartin allegedly shot Stephenson. Holyoke Police Sgt. Mark Werts said Stephenson had been shot with a rifle.

McMartin was subsequently arrested and charged with second-degree murder and felony menacing.

According to the Holyoke Enterprise newspaper, Stephenson worked at Sullivan’s Appliance and Air, where owner Jim Leibbrandt said he was a really good employee and a hard worker.

“Garrett Stephenson and I had a great working relationship,” he told the newspaper. “He will really be missed by all of us at Sullivan’s Appliance. As we worked together, our relationship grew, and he became more of a friend.”

Leibbrandt said Stephenson moved to Holyoke about 18 months ago to join his longtime friend McMartin, who had already been living in Holyoke. Holyoke is located about 180 miles northeast of Denver.

After an initial court appearance on Monday, McMartin is being held in the Logan County Detention Center in Sterling, Colo. His next court date is scheduled for Thursday, July 27 in Logan County Court.

Funeral arrangements for Stephenson are pending with Anderson Funeral Home in Marshalltown.

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Contact Jeff Hutton at 641-753-6611 or jhutton@timesrepublican.com