Bryan Titsworth / WFAA-TV

Two Dallas officers grieve after the shooting.

A Dallas police officer was killed in a gunfight Sunday morning as he chased a suspect in a residential neighborhood. The 28-year old patrol officer, Brian Jackson, was shot and killed in the 2400 block of Madera Avenue.

The officer suffered a gunshot wound through the underarm and died at Baylor Medical Center at 3:52 a.m.

Dallas Police Chief David Kunkle was himself on patrol about a mile away when the officer responded to a domestic disturbance in the 2400 block of North Henderson Avenue at about 2:44 a.m.

The chief fought back tears as he recounted the "gut-wrenching" incident and said that officer Jackson's co-workers said he "had an excellent reputation. He loved his wife. He loved his job."

Jackson and his wife, Joanne, had been married for just two months. "I asked Brian's wife what she wanted to say about him, and she just wanted to say that he was a good and caring man," the chief told reporters.

Police identified the suspect as Juan Lizcano, 28. About 45 minutes before Jackson was shot, Lizcano reportedly threatened his ex-girlfriend and fired a handgun inside a house in the 2400 block of Henderson.

Lizcano was not injured and surrendered to police after the fatal shooting. He was being held on one count of capital murder.

Investigators said additional charges were possible as the investigation unfolds.

This is the first police officer killed under Chief Kunkle's watch, since he assumed leadership of the 3,500 member department a year ago.

The chief acknowledged this is a trying time for his department. "We will provide psychological services for officers," he said. "We will make sure that the wife is given everything she needs in preparing for the funeral."