de stefano gave evidence on four occasions as a witness in the committal and trials of law clerk julian michael clarke in the murder of keith william allan. the first occasion was the committal of clarke at the melbourne magistrates court before magistrate barbara cottrell on 3 july 2003. the other occasions were during clarke's three trials in the supreme court of victoria. these were at the first trial before justice philip cummins on 1 march 2004, the second trial before justice david byrne on 15 may 2006, and the third trial before justice john coldrey on 2 april 2007.