White supremacist Neal Beckman was killed on March 7 in Ukiah, California, after shooting Ukiah Police Sergeant Marcus Young and stabbing a Wal-Mart security guard.

Beckman's attack on Young may have been prompted by the arrest of his girlfriend, Monica Winnie, 18, of Willits, California. She was arrested on suspicion of trying to return stolen items to Wal-Mart.

According to Ukiah Police Sgt. John McCutcheon, Beckman witnessed Winnie's arrest while sitting in her mother's car. Beckman approached Young with a knife and a .38 caliber Smith and Wesson handgun.

After a brief struggle, Young was shot four times, McCutcheon said. At that point, a Wal-Mart security guard tackled Beckman. Beckman stabbed him and escaped momentarily, but was shot and killed by the police officer.

Authorities later searched Beckman's car, discovering five pipe bombs. McCutcheon said the pipe bombs "were designed with shrapnel attached to them. They're designed to hurt people." Bomb-making materials were also found at the Winnie residence where Beckman was living. Jeffrey Allen Winnie, Monica's father, was arrested for possession of the materials.

Mendocino Major Crimes Task Force special agent John Lewis said Beckman had several tattoos, among them devil horns, flaming skulls and a tombstone that read "Till Death, NLR." The tattoos indicate allegiance to the Nazi Low Riders, a white supremacist street and prison gang that has committed numerous acts of violence in California in recent years.

In 1985 as a 17-year-old, Beckman robbed and killed a man from Willits, California. He was tried as a juvenile. Last year, Beckman and another man, Scott Imrie, 27, allegedly forced their way into the home of an elderly Ukiah man and his daughter, robbed them, then fled in the woman's car. The night Beckman died there was still a warrant for his arrest in connection to the robbery.