Gunman Brian Diez Kills 5, Abducts Own Kids Before Killing Himself

LOS ANGELES (Aug. 30) -- A long-running domestic dispute ended tragically over the weekend as 26-year-old Brian Diez killed his estranged girlfriend and four other people at a party in Lake Havasu City, Ariz., abducted their two young children and then drove more than 250 miles before killing himself at a relative's house in suburban Los Angeles, according to police.

The tragedy occurred late Saturday when Diez crashed the party for the current boyfriend of Deborah Langstaff, 23, police said, and opened fire, killing her; the boyfriend, Primo Verdone, 24; and three others. One person survived the slaughter, and police issued an Amber alert for Diez's car.

Brian Diez, 26 of Havasu, Ariz. Police say Diez killed five people after entering a home in the Arizona community and started shooting, and then fled with his two children.

Lake Havasu City Police Department / AP

Police say Brian Diez, 26 of Havasu, Ariz., killed five people after entering a home in the Arizona community. He then fled with his two children and was later found dead in California of a self-inflicted gunshot wound.

He turned up about 3:30 a.m. Sunday at an unidentified relative's house in Rancho Cucamonga, Calif., freed the children -- Kaia Diez, 4, and Cole Diez, 13 months -- then shot himself, The Press-Enterprise of Riverside, Calif., reported. It was unclear whether Diez killed himself in the car, which police had spotted, or elsewhere on the property.

Langstaff had obtained a restraining order against Diez earlier in the year, the Los Angeles Times reported.

Langstaff reportedly was a nurse at Havasu Regional Medical Center and lived with her grandfather and the two young children in the Lake Havasu City house where the party, and the killings, took place. Also killed were party guests Ashley Nyland, 20, Russell Nyland, 42, and Brock Kelson, 20.

The survivor, Deborah Nyland, 44, was being treated in intensive care at Sunrise Medical Center in Las Vegas.