PORT RICHEY, Fla. -- Released bodycam footage showed the tense moments between deputies and a suspect who believed he had a girlfriend.

Two people were killed; authorities suspect 30-year-old Brian Disario's actions might have been related to a mental illness.

Disario shot his mother's friend multiple times after believing the man was hitting on his girlfriend, Pasco County Sheriff Chris Nocco said.

"In his mind he did (have a girlfriend), but in reality he didn't," Nocco said.

Disario, his mother, his mother's boyfriend and the victim, identified as David James Armstrong, 56, were in a garage at 11605 Constance Ave. when the accusation was made. Disario then pulled out a long gun and shot Armstrong, Nocco said.

"We believe the victim was not immediately killed, he was on the ground wounded," Nocco said.

Armstrong was talking to Disario when he went into the house, retrieved another long gun, then shot him again, Nocco said.

The mother and her boyfriend then ran to a neighbor's house, where they contacted authorities, Nocco said.

Disario then headed to Gulf Island Drive, which is less than two blocks from Gulf Highlands Elementary.

"One of the witnesses stated that he saw the suspect actually point the gun at the school," Nocco said.

The first two responding deputies see Disario in the middle of the street, holding a long gun.

"At the time he had it down, pointed down," Nocco said. "The deputies challenged him, said 'sheriff's office.' As they're saying sheriffs' office, he raises the gun at the deputies and starts firing rounds at the deputies in the middle of the street at a close proximity to the school.

"Our deputies returned fire. There is a gun battle out in that street."

Disario finds cover behind a vehicle, then shoots more rounds at the deputies, Nocco said.

Disario then runs back into his home, which is when the deputies discovered Armstrong's body.

Both deputies were not injured.

Other arriving deputies set up perimeters around the home and the school.

"We were afraid he was going to start another gun battle with us," Nocco said.

A sheriff's office robot found Disario's dead body inside the home. How he died wasn't immediately disclosed.

Disario had a history of mental illness and was collecting guns, including a drum that had a large amount of ammunition, Nocco said.

Sky10 flew over the scene after the area was deemed safe:

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