In GTA5, who tipped off the police about the robbery of North Yankee Town Bank in Ludendorf nine years ago?

It's Mike, because Mike wants to wash his hands with FIB for the safety of his family. Did you see Dave who shot Brad, the policeman who later knocked Mike unconscious? The conversation between Mike and Dave in the later period clearly shows that Mike and FIB are cooperative. At that time, Dave raised his gun as if to kill the most threatening Trevor, but at that moment, Brad just walked in front of Trevor and became Trevor's scapegoat and died on the spot. Trevor has a quick reaction. After Brad was shot, he quickly hid in the bunker so that Dave could never have another chance to shoot him. At this time, Mike didn't hide like Trevor, but went to check Brad's injury in a high-profile way, and then stood up, as if he had accidentally waved his arm. In fact, it clearly shows that Dave shot himself, then Trevor was shot, and then Trevor had no choice but to run away. Then Mike pretended to be dead Brad and buried himself, which means he is dead. And lied that Brad was shot and not arrested, but died on the spot. Later, McToni changed his name to MacDish Santa Claus and successfully washed his hands and retired. This is the story of ten years ago.