Police in Northern California said the gunman who killed four people and wounded 10 others Tuesday had an ongoing dispute with a woman who lived in his neighborhood. That woman, who filed a restraining order against him earlier this year, was one of the first to be killed in the rampage. The Associated Press reports that the gunman—who was identified by multiple news outlets as Kevin Neal—had stabbed the neighbor during a dispute in January. Neal’s mother told the news agency that she had paid the bond to have him released from jail. Neal reportedly told his mother the day before the attack, “I’m on a cliff and there’s nowhere to go.” Police say they responded to another “domestic violence” incident involving him on Monday. “This was a bizarre, murderous rampage (to) get even with a neighbor,” said Assistant Sheriff Phil Johnston.