Chris Paulsen was at a Cheesecake Factory at Quaker Bridge Mall when he got the call. His brother was dead. “My mouth dropped. I’m in a state of disbelief,” Chris Paulsen recalled. “We go back to the house. He was already on the stretcher and under the cover… “It never crossed my mind that he could’ve been murdered.” Ten years later, Steve Paulsen’s family is still seeking answers as the case remains ensnared in a kind of legal system purgatory. Steve died of antifreeze poisoning — with amounts found in his body indicating poisoning, not suicide. And the Somerset County Prosecutor’s Office h…