For the GTA Online Heist mission The Prison Break, and it's setups, the person you are in contact with Agent 14. He never mentions his name, but many players have speculated that he is Agent Haines. They look very similar, and sound the same. The only difference , is the eye color, but, he may be wearing contacts. GTA Online is 6 months before GTA V, so it is possible that they are the same person.