SAN ANTONIO — Andrew Perales says he has replayed Tuesday night over and over in his mind, searching for a reason why someone would gun down his two sons outside their West Bexar County home.

He still can’t find one.

We’re not those kind of people,” Perales said. “We always help people. People always come to us for help. We don’t have enemies.

His sons, 11-year-old Maliki Perales and 20-year-old Drayden Quiroz, died after investigators say they were shot in an unprovoked attack by a neighbor Tuesday evening.

RELATED: 20-year-old dies hours after 11-year-old brother in unprovoked shooting

Bexar County investigators say 40-year-old Daniel Antonio Perez crossed the street from his home and opened fire on the brothers as they were outside their family’s residence shortly after 7:30 p.m. near U.S. Highway 90 and Loop 1604. Authorities say there was no known history between the families and no apparent provocation for the attack.

Perez has been charged with two counts of capital murder and four counts of aggravated assault with a deadly weapon. His bond has been set at $2.3 million.

For Perales, the investigation offers little comfort.

He remembers his sons as hard-working young men who spent nearly every day by his side.

“We worked,” he said. “Working, barbecuing, checking out the radio, watching movies, movie nights.”

Perales said Drayden worked alongside him in the family business and never stopped trying to help, even after months of serious health problems.

“Before the DKA … he was just a normal kid trying to get his life together,” Perales said. “Even though it wasn’t much, he would still try.”

He said Maliki was known for his kind heart.

He was a real loving boy,” Perales said. “He just always gave hugs. Got awards for it, too.

The moments leading up to the shooting still haunt him.

Perales said the family had asked his sons to move their vehicle because it was partially blocking the sidewalk. Moments later, one of the boys called to say a man across the street was staring at them.

“I hear pops,” Perales recalled. “My wife starts screaming.”

He grabbed his gun and ran outside.

I tripped over him,” he said, describing finding one of his sons on the ground. “The guy was across the street reloading, started to shoot again.

Perales said he tried desperately to save his youngest son.

“I tried to perform CPR,” he said. “I can’t run… but I ran.”

Hours later, he learned he had lost both of his boys.

“My oldest boy… he died at 9:03 this morning,” Perales said. “Twelve hours later, he just finally went.”

The grief has been overwhelming.

“I don’t even know how I’m gonna bury him,” Perales said. “I don’t know how I want to carry on. I don’t know what I’m gonna do.”

One moment has become especially painful.

The family had recently ordered Maliki a new pair of shoes for school. They were delivered the day after he died.

His shoes are coming today,” Perales said. “The shoes I paid money for, he’s never gonna wear. But I’m gonna keep them.

Despite his loss, Perales wants people to remember his sons for the lives they lived, not the way they died.

“My boys were strong. They were fighters. I raised them right. They had good morals. They had good values,” he said.

He said helping others was simply part of who they were.

“We’d go feed the homeless. We’d help everybody. It didn’t matter who you were, what color you were. If you needed us, we were there.”

When asked what he would say to the man accused of killing his sons, Perales paused before offering a brief response.

“No comment,” he said. “The devil knows my intentions, but God knows my heart.”

A GoFundMe page has been set up to help the family with funeral arraignments.