Brian Diez allegedly killed his estranged girlfriend and four others in Lake Havasu City before abducting his two young children and shooting himself in Rancho Cucamonga.
The apparent suicide came after he dropped off his two young children, whom he had abducted from the shooting scene in Lake Havasu City in Arizona, according to authorities.
One of the victims, identified as the mother of the children, had obtained a restraining order against the alleged gunman, Brian Diez, earlier this year, according to Sgt. Joe Harrold of the Lake Havasu City Police.
Diez, 26, was prohibited from contacting Deborah Langstaff, 23, and their two young children, Harrold said. A misdemeanor domestic violence charge was also pending against Diez in connection with an alleged slapping incident involving his infant son, Harrold said. Diez had pleaded not guilty.
The bloodshed began shortly before midnight Saturday. Diez allegedly burst into Langstaff's home in the 300 block of Opossum Drive in Lake Havasu City, where she was holding a birthday party for her new boyfriend, police said.
Diez allegedly killed Langstaff and three others at the home and wounded two partygoers, one of whom later died at the hospital. Diez then fled with his two children, a 13-month-old boy and 4-year-old girl, and drove to a relative's home in Rancho Cucamonga. He left the children there before apparently shooting himself, officials said.
Langstaff, a nursing unit manager at Havasu Regional Medical Center, and Diez had separated, Langstaff's grandfather told The Times in a brief phone conversation.
Neighbors in the tract of single-story desert homes with rock gardens said it appeared Diez moved out at least a month ago. The couple had lived in the home about a year and mostly kept to themselves, and there had been no outward signs of strife, the neighbors said.
"I don't understand this," said neighbor Teresa Williams, whose bedroom faces the Langstaff residence. "There's never been any chaos … never been a sign that anything was amiss."
Langstaff had invited friends to celebrate the 24th birthday of her boyfriend, Primo Verdone, police said. Verdone was among the victims pronounced dead at the scene along with Langstaff, Ashley Nyland, 20, and Russell Nyland, 42.
Two others, Brock Kelson, 20, and Deborah Nyland, 44, were taken to Sunrise Medical Center in Las Vegas, where Kelson died. Deborah Nyland was in intensive care with a good prognosis, Harrold said.
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