ANCHORAGE, Alaska (AP) — A stunning tale of inappropriate behavior between a politician and a television anchor, death threats and nude photos culminated in a joint police and FBI investigation, the arrest of the journalist and the resignation of the mayor of Anchorage.

Ethan Berkowitz, the top elected Democrat in Alaska, submitted his resignation to the Anchorage Assembly on Tuesday night, just days after he vehemently denied allegations by YourAlaskaLink anchor Maria Athens that he had posted nude photos of himself on an underage website.

The mayor’s resignation followed Berkowitz’s jaw-dropping admission Monday that he was involved in an inappropriate sexting — he called it “messaging” — relationship with Athens, the anchor of a combined Fox/ABC station in Anchorage. She says their relationship started in 2016, and declined to say whether it ever became sexual in nature.

“My resignation results from unacceptable personal conduct that has compromised my ability to perform my duties with the focus and trust that is required,” Berkowitz wrote.

“I apologize to the people of Anchorage for a major lapse in judgment I made several years ago when I had a consensual, inappropriate messaging relationship with reporter Maria Athens. I’m embarrassed and ashamed for the hurt I’ve caused my family and our community. I take responsibility for my actions,” Berkowitz added.

The five days that roiled Alaska’s largest city began Friday morning, when Athens allegedly placed a profanity- and racist-laden phone call to Berkowitz. The voicemail, a copy of which was obtained by The Alaska Landmine online blog, started with the caller announcing herself as Athens and rattling off her various network affiliations.

The caller claimed to have learned from sources that Berkowitz had been posting nude photos on an underage website, and that she planned to report this on that evening’s news. The caller threatened to kill Berkowitz, who is Jewish, and his wife, in a rant laced with racist insults.

“You either turn yourself in, kill yourself or do what you need to do,” the voicemail said.

“I can’t believe I am such a good person and thought I loved you,” the caller continued. “I don’t even hate you. I will pray for your Zionist f*****g a**. … And I’m putting this on the news tonight. Bye. Have a great Friday!”

The caller also predicted she would win an Emmy for her reporting.

Later Friday, Athens taped a tease for the story and posted it to her Facebook page, prompting this denial from the mayor’s office: “The slanderous allegations from Your Alaska Link reporter Maria Athens are categorically false and appear to be the product of someone who is hostile and unwell.”

The same afternoon, Athens then posted what she claims to be a photo of Berkowitz’s nude backside on her Facebook page as proof of her allegations.

Here is what happened later that day, according to the district attorney’s charging documents:

Athens and the station’s manager, who is described as her boyfriend in the documents, got into an argument while driving in Anchorage. He made her get out of the car and told her she was barred from returning to the station.

Athens nevertheless went back to the television studio and attacked him. When police arrived, she hit an officer trying to arrest her and was placed in full restraints after she tried to kick out the back window of the police cruiser with her high heels.

Athens was charged with assault, criminal mischief and disorderly conduct, and released after posting bail.

Anchorage police and the FBI investigated the allegations and the death threat, but an FBI statement released Tuesday said it found “no immediate evidence to support a violation of federal law; however, the FBI Anchorage Field Office continues to monitor the situation.”

Athens told the Anchorage Daily News she and Berkowitz began communicating in 2016 on the messaging platform WhatsApp.

“When he slided into my texts, he was so smooth with his little witty slogans and pictures,” Athens told the newspaper. She has not returned messages left by The Associated Press.

Athens, a graduate of Seton Hall University in New Jersey, said she was feeling isolated in Alaska. “He gave me attention when I was lonely.” She declined to say whether the texting relationship ever became physical.

Athens said she deleted the messages from her phone, which she said is now in the hands of law enforcement.

She also declined to elaborate on her assertion that Berkowitz was involved in illegal activities, saying it was based on what sources told her. She did not say who the sources were.

Messages left with Berkowitz through his office and with station management were not returned to the AP. Berkowitz’s resignation is effective Oct. 23.

According to the city charter, Felix Rivera, chairman of the Anchorage Assembly, will serve as acting mayor until a special election is held if the assembly doesn’t choose to reorganize. If Rivera does become mayor, he will hold a trio of distinctions: the city’s first openly gay mayor, the first Latino and at age 31, the youngest. The next youngest would be James Delaney Sr., who was either 32 or 33 when he was elected in 1929.

Berkowitz was elected to his second three-year term as mayor in 2018. The officially non-partisan position is limited to two terms.

Berkowitz, a native of San Francisco, is also a lawyer and Anchorage businessman. He served as a Democrat in the Alaska House of Representative from 1997 to 2006, serving the last two years as minority leader.

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AP investigative researcher Randy Herschaft in New York contributed to this report