He was unemployed rock musician with a history of opioid abuse and credit card theft, not to mention a dalliance with North Korea-linked hackers. Valentin Broeksmit, an informant who worked with federal authorities investigating former President Trump's relationship with the German financial giant Deutsche Bank, was found dead Monday April 25 2022 on a high school campus in the El Sereno neighborhood in Los Angeles. Mr. Broeksmit’s late father, Bill, had been a senior executive there, and his son possessed a cache of confidential bank documents that provided a tantalizing glimpse of its internal workings. He was born in Ukraine in 1976, and his parents, Alla and Alexander, emigrated to Chicago three years later. Their marriage collapsed; Val and his father landed in a homeless shelter; and in 1982, Cook County took custody of the boy, placing the frightened 6-year-old in a foster home. Meanwhile, Alla met and married Bill Broeksmit, who was then an up-and-coming banker. They moved to New Jersey and eventually extracted Val, then 9, from the foster care system. Bill adopted him. When his father died and Mr. Broeksmit came into possession of his documents, he finally had an opportunity to make the world pay attention. Mr. Broeksmit started seeking out other big stories. Late that year, a group of North Korea-linked hackers, calling themselves the Guardians of Peace, penetrated the computer systems of Sony Pictures. When the hack became public, Mr. Broeksmit followed a bread crumb trail of links until he eventually came across an email address for the hackers. Mr. Broeksmit, leaning into his new persona as an exposer of corporate secrets, took to Twitter to post embarrassing Sony files. David Boies — Sony’s attorney and arguably the most famous lawyer in America — sent Twitter a letter demanding that it shut down Mr. Broeksmit’s account. He learned that his father had once looked into the conduct of some Deutsche Bank traders and concluded — mistakenly — that nothing was amiss. It turned out the traders were manipulating a benchmark known as Libor. Word spread in journalism circles that the son of a dead Deutsche Bank executive had access to revelatory materials. In Rome on New Year’s Eve of 2016, Mr. Broeksmit shared the files with a reporter for the Financial Times, periodically excusing himself to snort 80-milligram hits of OxyContin, and the journalist later connected him with someone willing to pay for the documents. On the third anniversary of his father’s death — Jan. 26, 2017 — $1,000 arrived in his PayPal account. The money was from Glenn R. Simpson, a former journalist who ran a research company called Fusion GPS. Mr. Simpson asked Mr. Broeksmit to travel with him to Washington and meet some of his contacts. Mr. Broeksmit shared some of his files with a Senate investigator and a former prosecutor in the Manhattan district attorney’s office. Mr. Broeksmit moved to Los Angeles to drum up Hollywood interest in his life story. Early this year, a producer invited him to a dinner party. Among the guests was Moby, the electronic music legend, who told me he was impressed by Mr. Broeksmit’s exploits and existential sadness. Moby arranged an introduction to his friend Adam Schiff, the chairman of the House Intelligence Committee, which had recently opened an investigation into Deutsche Bank’s relationship with Mr. Trump.