Two men died in a shooting that authorities are investigating as a murder-suicide after they argued at a boat launch in northwestern Montana.

Authorities were sent to the Rexford Bench boat launch near Eureka around 3:15 p.m. on Wednesday because of reports of a shooting, The Missoulian reported.

Officers determined that 40-year-old Oregon resident Eric Newman and 51-year-old Christopher Foster, of Kalispell, Montana, were arguing while loading boats, the Lincoln County Sheriff’s Office said in a statement.

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Newman got into his car to back down the ramp and Foster then allegedly pulled out a handgun and shot Newman, according to the sheriff's office.

Montana Fox News graphic

A suspected murder-suicide at a northwestern Montana boat launch left two people dead. (Fox News)

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Newman retreated to the parking area and was later found in his vehicle with an apparent self-inflicted gunshot wound, the statement said.

Both men died at the scene.

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The Eureka Police Department, U.S. Border Patrol agents, the U.S. Forest Service and the Eureka Volunteer Ambulance department also responded. An investigation is ongoing.