Pagan testified at a murder trial in
which he was the actual murderer.
Guess who they were referring to! (Well, at least he's still in the clink, we learned.)
... The government used cooperating witnesses—"big fish"—who admitted to more serious crimes than the charges faced by the people they were testifying against.
This is, generally speaking, the opposite of how cooperating witnesses work. Usually, legal experts said, the goal is to get those witnesses to admit to wrongdoing, cooperate with the government and to walk the investigation up the ladder, obtaining evidence against leaders or those potentially engaged in more serious crimes. In exchange, on the recommendation of prosecutors, cooperators typically end up serving reduced or no prison time.