A man from Wisconsin has been taken into custody after allegedly confessing to the murder of his neighbor at a Department of Homeland Security office. The incident took place in Milwaukee, where Dominic Nosacek, aged 31, is now facing charges of first-degree intentional homicide following the death of 50-year-old Angelo Nelson.

According to a criminal complaint reviewed by Law&Crime, Nosacek walked into a DHS office on Monday morning and informed a security guard that he had committed the crime. The complaint details that Nosacek entered the building at around 11:25 a.m., where he reportedly declared, “I just killed a militia, I shot him in the head.”

After Nosacek’s confession, the security guard promptly contacted 911. Nosacek was then subjected to a metal detector screening and was asked to sit down. He informed the guard that he had left the weapon, identified as an AK-47, at his residence on N. Astor Street. Remarkably, Nosacek mentioned that after the shooting, he returned to his apartment and completed his taxes.

Further information was provided by a second security guard who overheard Nosacek saying, “I just killed somebody,” and describing the victim as a “terrorist.”

Authorities later discovered Nelson’s body in the hallway of the apartment building. He had suffered a fatal gunshot wound to the head.

Nelson’s body was found in the hallway of the apartment. He died of a single gunshot wound to the head.

After investigators took Nosacek in for post-Miranda questioning, Nosacek was asked about the activity at his apartment building. He replied that his neighbors “bang around too much” and “harass” him. After informing detectives that he had a history of “psychosis” and “depression,” Nosacek said that his neighbors were “militia men” who were “blackmailing” him.

Nosacek claimed that his neighbors did things to “provoke” him. When he saw Nelson standing in the hallway, he believed the other man was “waiting for him.” As Nosacek left his own apartment, firearm in hand, he told police he shot Nelson so he “could not get to him.”

When asked if he intended to kill Nelson, Nosacek said, “Yeah, because they are militia.” Nosacek said he did not see Nelson holding a weapon, and the two men did not have an argument.

Nosacek was charged with first-degree intentional homicide and bail jumping in connection with a previous criminal charge. After his first court appearance on Thursday, his bail was set at $251,000 cash. He remains in custody. His next court date has not been scheduled.

Nelson’s best friend D’Juan Hill spoke to local Fox affiliate WITI to remember the man he knew since middle school, saying, “I want the world to know about Angelo Nelson.”

Local CBS affiliate WDJT spoke to Nelson’s mother, Patricia Donald, who told the station her son “was funny, he was a people person, he loved people.”

Friends and family started a GoFundMe page to raise money for funeral costs.