So maybe...

While kensi was investigating her father's death, one of his old members realized that she was getting to close and he had his son(Deeks) keep tabs on her and the rest of the team. Hetty has her suspicions about Deeks and figures to keep the "enemies closer" and has him become the liaison. Hetty also discovered that there's a contract out on Kensi and knows that Deeks is the one who is the mole. She figures she'll pretend it's business as usual do Deeks doesn't get suspicious. Deeks,in the meantime actually falls in love with Kensi and his father reminds him to get the job done or he'll kill his Mom. Obviously Deeks Mom and her ex hate each other. Anyway just a thought..