In this episode of Comm Center, we dissect the shocking role played by gang-linked henchmen Luis Rivera and Sigfredo Garcia in the cold-blooded murder of FSU law professor Dan Markel. It was a contract killing tied to a bitter custody battle and a wealthy South Florida family.Former dispatcher Jon and retired cop Drew walk you through the investigative work that nailed Rivera and Garcia — from ATM footage to cell tower pings to a green Prius on a bus cam. And when Luis Rivera flipped with a plea deal, the dominoes started to fall, giving prosecutors the leverage to go after Charlie and Donna Adelson.This is part 4 in our deep-dive series on the Donna Adelson Trial — where true crime meets boots-on-the-ground police insight.