(CNN) -- Matthew Murray, the man who police say shot and killed four people at two separate locations in Colorado on Sunday, died from a self-inflicted gunshot wound, the coroner's office said Tuesday. 

A former roommate took this photo of Matthew Murray performing in a 2002 Christmas program. 

"The death of Matthew Murray has been ruled a suicide," the El Paso County Coroner's Office said in a statement. 

"It should be noted that he was struck multiple times by the security officer, which put him down. He then fired a single round killing himself," the statement said. 

Police Sgt. Skip Arms told The Associated Press that Murray shot himself in the head. 

Police say before Murray, 24, went down, he shot and killed sisters Stephanie and Rachael Works, ages 18 and 16, and wounded their father, who was in or near their car in the parking lot of New Life Church in Colorado Springs, Colorado. 

Murray also wounded two other people with his assault rifle as he re-entered the church. 

One of them, Larry Bourbonnais, said he tried to distract the shooter before security guard Jeanne Assam made her move. Watch Bourbonnais describe the scene at New Life » 

"I'm telling you right now, she's the hero, not me. It was the bravest thing I have ever seen," Bourbonnais said. "She had no cover. He fired -- I heard him fire three. I heard her fire three. And she just began -- she kept yelling 'Surrender!' the whole time. And she just walked forward, like she's walking to her car in the parking lot, firing the whole time." 
Where were they?
Police say before Murray, 24, went down, he shot and killed sisters Stephanie and Rachael Works, ages 18 and 16, and wounded their father, who was in or near their car in the parking lot of New Life Church in Colorado Springs, Colorado. 
