Del Taco Massacre: Jimmy Schlager Attacks Stepdaughter's Family of Four, Kills 2, Commits Suicide

LOS ANGELES (CBS/AP) it's being called one of the worst crime scenes in recent San Bernardino, Calif. history, and authorities are still trying to figure out what triggered it.

According to witness reports Jimmy Schlager walked in to a Southern California fast food restaurant Saturday afternoon and opened fire on his stepdaughter's family of four, killing her husband and 6-year-old son and critically wounding her and the couple other child, a 5-year-old boy, before turning the gun on himself.

He died hours later after being taken to a hospital.

Police have identified the two murder victims as Alex Trujillo and his son Adrian. The conditions of the 29-year-old mother, who was shot up to 10 times, and her 5-year-old son, who was shot twice, were upgraded from critical Sunday as they underwent surgery at Loma Linda University Medical Center, according to the Riverside Press Enterprise.

The mother was listed as fair, and the boy was listed in serious condition, hospital spokesman Herbert Atienza said. Their identities have not been released.

Schlager, who is from Lancaster in northern Los Angeles County, had an extensive criminal record dating back to 1972 that included assault with a deadly weapon and a restraining order taken out by a co-worker.

Schlager was reportedly married to the young woman's mother, who died several years earlier. Police are still trying to piece together their relationship to get some idea of what would have triggered such a violent attack.

The restaurant reopened Sunday afternoon, but the table where the family was sitting, scarred with bullet holes from the rampage, had been removed. In its place was a makeshift memorial created by family members with cards, flowers and candles.