From KGMC, which had changed to KWBZ, he moved to KHOW in Denver. After being fired from KHOW, Berg went back to KWBZ before it changed to an all-music format and he was again fired. Berg, now unemployed, was courted by KTOK in Oklahoma City, Oklahoma and WXYZ in Detroit, Michigan. He ended up taking a job at KOA in Denver, debuting on February 23, 1981. He worked there up to his death.
Listeners in more than thirty states over KOA's 50,000-watt signal heard Alan Berg's opinions about gun control, homosexuality, religion, antisemitism and other topics. Berg became notorious for upsetting callers who vociferously disagreed with him to the point of being unable to express themselves which Berg would then further berate. While his style was controversial, in the latter stages of his life, Alan Berg did begin to tone down somewhat. This was especially true after he returned to the airwaves after serving a suspension for berating former Colorado Secretary of State Ellen Kaplan on his show.
The murder weapon, a semi-automatic Ingram MAC-10 which had been illegally converted to an automatic weapon, was later discovered at the home of one of The Order's members by the Federal Bureau of Investigation's Hostage Rescue Team. The weapon was part of a homemade altar dedicated to Adolf Hitler.
Ultimately, four members of The Order were indicted, including Robert Mathews, who conceived the plan to assassinate Berg. However, only the actual shooter, Bruce Pierce, and the getaway driver, David Lane, were convicted.
Lane, a former Klansman who joined the neo-Nazi/Christian Identity group Aryan Nations, steadfastly denied any involvement in Alan Berg's murder, but also never expressed sorrow over it. In the History Channel documentary, Nazi America: A Secret History, Lane, who had called into Berg's show and deliberately goaded him into an argument, stated: "The only thing I have to say about Alan Berg is: regardless of who did it, he has not mouthed his hate-whitey propaganda from his 50,000-watt Zionist pulpit for quite a few years."
Lane died in prison on May 28, 2007 while serving a 190-year sentence for violating Berg's civil rights and Racketeer Influenced and Corrupt Organizations statutes.