SANTA MONICA, Calif. -- A woman who was critically wounded in last week's Santa Monica shooting rampage died Sunday, bringing the total number of victims killed by the gunman to five.
Marcela Franco, 26, died of her injuries at Ronald Reagan UCLA Medical Center, according to Santa Monica College spokeswoman Tricia Ramos.
Franco had been a passenger in a Ford Explorer driven by her father, campus groundskeeper Carlos Navarro Franco, 68, who also was killed in Friday's attack.
Investigators trying to determine why the gunman planned the shooting spree were focusing on a deadly act of domestic violence that touched off the mayhem.
The heavily armed man's attack against his own family led to the violence in Santa Monica streets, lasting just a matter of minutes until he was shot to death in a chaotic scene at the college library by police.
Investigators were looking at family connections to find a motive because the killer's father and brother were the first victims, an official briefed on the probe who requested anonymity because he wasn't authorized to speak publicly told The Associated Press.
The killer, who died a day shy of his 24th birthday, was connected to a home that went up in flames after the first shootings, said police Chief Jacqueline Seabrooks. She refused to elaborate or name the suspect because a surviving family member was out of the country and couldn't immediately be notified.
SWAT team officers searched the shooter's mother's Los Angeles apartment and officers interviewed neighbors about the son who lived with her, said Beverly Meadows who lives in the adjoining unit.
Public records show that Meadows' neighbor is Randa Abdou, 54, the ex-wife of Samir Zawahri and former co-owner of the house where the first shooting took place.
Abdou was out of the country visiting relatives and wasn't expected home for another week, Meadows said. It wasn't clear if the son who lived with Abdou was a victim or the suspected gunman.
Zawahri, 55, brought his family to the neighborhood of small homes and apartment buildings tucked up against Interstate 10 in the mid-1990s, according to property records.
Not long after arriving on Yorkshire Avenue, the couple went through a difficult divorce and split custody of their two boys, said Thomas O'Rourke, a neighbor.
When the sons got older, one went to live with his mother while the other stayed with the father.