They're looking at possible tax evasion and other financial misconduct when McCourt owned the Dodgers and associated companies, the Daily Journal is reporting, citing sources. The investigation, which is said to be in the early stages, has been turned over to prosecutors in the tax division of the Los Angeles U.S. attorney's office. They've been sending subpoena letters over the past several months. From the Daily Journal (no link):
Numerous questions involving Dodger-related finances arose during the McCourts' closely watched divorce proceedings. Testimony during the case revealed that companies controlled by the McCourts paid two adult sons, Travis and Drew, a combined $600,000 annually despite one son working at Goldman Sachs in New York and the other attending Stanford University full-time. Jeff Ingram, one of Frank McCourt's financial advisors, testified that the couple used the Dodgers and other businesses as a "credit card."
McCour has hired defense lawyer David Scheper, former chief of the criminal division in the U.S. attorney's office. Another McCourt attorney said that the former Dodger owner is "not a target, not a subject" of the ongoing investigation.