A Stockton, CA, police officer was killed Tuesday morning responding to a domestic violence call.

The incident began with a 911 call about domestic violence.

"This morning, at 9:45 a.m., the Stockton Police Telecommunications Center received a call of a domestic disturbance. The caller reported hearing screaming, saw a woman with a ripped shirt who was bleeding, and appeared to have been assaulted," the Stockton PD said on Facebook .

Stockton Police say Officer Jimmy Inn knocked on the security door and stood off to the side when a voice from inside the residence said, "hey police" and the suspect opened fire on Inn, hitting him multiple times, ABC10 reports.

Stockton Police Officer Pancho Freer says he arrived as gunshots rang out and saw Lance Lowe, 30, standing over Inn with a gun in his hand. Police say Lowe then began shooting at Freer, hitting his patrol car. After Freer began shooting back at Lowe, the suspect walked back inside his home and later returned with his 8-year-old son in the front yard.

According to police, Lowe began to strangle his son in front of police and when he didn't listen to Freer's orders to stop, a community member tackled him, freeing the child.

Freer then shot Lowe multiple times.

Both Officer Inn and Lowe were taken to a nearby hospital for treatment where they both died.

Stockton Police say a multi-agency critical incident investigation has been initiated, as is protocol with officer-involved shootings. The investigation will be conducted by the San Joaquin County District Attorney’s Bureau of Investigation, California’s Department of Justice, and San Joaquin County Medical Examiner’s Office.