MINNEAPOLIS (AP) — A man who died earlier this week after he was shot by agents from the Bureau of Criminal Apprehension had apparently charged at authorities with a knife while they were working an undercover investigation into underage prostitution, police said Thursday.

Authorities identified the man as Adam Jo Klimek, 31, of Alexandria. Police said he died Tuesday after he was shot.

According to the St. Paul Police Department, which is handling the investigation, BCA agents were in Alexandria working an undercover operation involving the solicitation of minors when they encountered Klimek inside a home.

Police did not release details about what Klimek was doing. But they said when Klimek was told he was being arrested, he charged at three agents with a knife. Two agents — Elizabeth Eilers and Dustin Van der Hagen — shot at Klimek. Authorities said the agents immediately rendered aid and called paramedics. Klimek died at the scene.

The Midwest Medical Examiner’s Office is working to determine Klimek’s cause of death.

Details of the prostitution investigation were not immediately released.

Klimek was on probation after pleading guilty in 2014 to one count of prostitution with someone under age 13.

According to court records in that case, Klimek admitted in Olmsted County Court that he hired a prostitute on Craigslist and intended to have sex, but did not. He admitted he didn’t know she was 12, but that mistake of age was not a defense. A prison sentence was stayed and he was sentenced to 20 years of probation, 90 days on work release and ordered to register as a sex offender.

His attorney in that case, Christopher Karpan, had no comment, but said Klimek’s family wants to know what happened in Alexandria.

“I did not expect this,” Karpan said of his client.

The St. Paul Police Department is investigating at the BCA’s request.

St. Paul investigators have gone to Alexandria to interview witnesses and review evidence. When the investigation is done, they’ll turn their findings over to the Douglas County Attorney’s Office for possible charges.

BCA spokesman Jill Oliveira said Eilers has been a BCA special agent for nearly 10 years, and Van der Hagen has been a BCA special agent-in-training for one month. He joined BCA after working with the Willmar Police Department for 11 years.

Neither agent has any disciplinary actions or complaints in their BCA files, according to information from the bureau.

Authorities did not release Klimek’s race or the races of the agents, but Karpan confirmed Klimek was white.