Blitzer just played a clip from Larry King where we learn how Booby got involved. After he read Fitzgerald's report he called the source and said whatup with Fitzgerald not knowing about you, and the source said he had to go to the prosecutor and "tell the truth" (no mention of whether s/he had lied before or not). Booby then asked if he was free to testify since the source was going to the prosecutor anyway and the source said yes.
Weird, really.