In 2023, he was indicted for theft from the Montana Historical Society of objects of cultural heritage, including archival documents such as letters from Nancy Russell, wife of artist C.M.

At sentencing, U.S. Attorney Jesse Laslovich stated, “D’Ambrosio’s actions were intentional and calculated—designed to steal Montana’s cultural treasures so he could profit."

After publishing some poetry and a couple of travel books, D'Ambrosio turned to writing primarily about Montana topics, sports, and true crime.

[2] According to a December 2019 House of Mystery Radio program, D'Ambrosio worked as a private investigator and true crime journalist in Montana and Kansas.

[21][22] In November 2023, D'Ambrosio was indicted on 10 counts related to theft of objects of cultural heritage from the Montana Historical Society which he offered for sale on eBay or to private collectors.

[2] The prosecution argued that the items D’Ambrosio stole would bring him significant profit, such letters from Nancy Russell, wife of artist C.M.

[23] U.S. Attorney Jesse Laslovich stated at sentencing, “D’Ambrosio’s actions were intentional and calculated—designed to steal Montana’s cultural treasures so he could profit.