An Oregon City police officer who was shot and critically injured when he responded to a house fire Sunday afternoon has died.

The victim was identified Monday as 41-year-old Reserve Officer Robert Libke. He had been with the department since 2009. He was taken off life support at 12:03 p.m. Monday at Legacy Emanuel Medical Center, the Multnomah County Medical Examiner's Office told KOIN. His body was scheduled to be transported at 4 p.m. to Lincoln Memorial Park Funeral Home on Southeast Mt. Scott Boulevard.

At about 1 p.m. Sunday, Oregon City police and Clackamas County Fire District No. 1 crews responded to a house fire at 841 Linn Avenue. Neighbors told 911 dispatchers that the home was ablaze and the owner, 88-year-old Lawrence Cambra, was running around the property with a gun.

Libke was one of the first officers on scene. According to the Clackamas County Sheriff's Office, he was confronted and shot by Cambra. Sheriff's office SWAT, along with multiple area law enforcement agencies, responded.

"Our biggest concern once the officers got to him was to get him safely out of the area, get him to advanced life support," West Linn Police Sgt. Neil Hennelly told reporters Monday. "The SWAT has an emergency trauma physician as part of their deployment, and he was their lead person in getting Officer Libke removed from the scene."

As the SWAT team was rescuing Libke, they located Cambra. Shots were fired and Cambra was killed at the scene.

Libke was airlifted to Legacy Emanuel.

Meanwhile, it took several hours for firefighters to bring the blaze under control. There was also a small natural gas leak. The fire was likely arson, the sheriff's office said. Deputies have no motive for the fire or shooting, Hennelly said.

The two SWAT members involved in Cambra's shooting were identified as Detective Sgt. Matt Swanson and Deputy Jesse Unck. Swanson is a 13-year veteran of the sheriff's office. Unck is a four-year veteran. Both are on paid administrative leave per department policy.

The last and only Oregon City police officer to be killed in the line of duty occurred more than 107 years ago. In April 1906, Officer George J. Hanlon was shot and killed while trying to apprehend a burglar, the sheriff's office said in a news release.

Libke is one of seven reserve officers with the department. Reserve officers are volunteers and do not get paid.

The investigation into the fire is being conducted by the Bureau of Alcohol Tobacco, Firearms and Explosives, Oregon State Police and the Clackamas Fire Marshal. The shooting investigation is being conducted by the Clackamas County Major Crimes Team, which is made up of officers from the FBI, OSP and several local police departments.

A fund for Libke has been established through the Clackamas County Peace Officers Benevolent Foundation. To make a donation, got to CCPOBF.org or visit any Clackamas Federal Credit Union.