Diego Velasquez is the husband of Carla Velasquez.
Diego's wife, Carla, had a $12 million dollar bracelet that she wore all the time. Ben and Margot were tasked with stealing it. They planned to do so by getting invitations to a dinner she was hosting at the consulate that week. From there, they just planned to lift it off her. They enlisted Felicity's help because it was a three-person job.
At the dinner, Ben bribed the band to play the song Carla Diego danced to at their wedding. During the dance, Margot slipped the bracelet off Carla's wrist and, though Felicity, handed it off to Ben, who left with it.
He is married to Carla Velasquez.