 He provided damaging testimony against Peter Gotti, Louis "Big Lou" Vallario, Frank Fappiano, Richard V. Gotti, Richard G. Gotti, and Michael Yanotti.DiLeonardo also testified at the four mistrials in which Junior Gotti was charged with ordering the 1992 abduction and assault of radio commentator Curtis Sliwa.Finally, in October 2006, DiLeonardo testified against former Colombo crime family acting boss Alphonse Persico, and underboss John "Jackie" DeRoss in their trial for the 1999 murder of former underboss William Cutolo.