Shane Newsome was the best friend of Dickie Stabler.
Shane was a recovering drug addict. He and Dickie both attended Cardinal Catholic Preparatory School together and were best friends, despite the extreme disapproval of Dickie's parents Elliot and Kathy. One day, the two went missing. Shane used Dickie's credit card and was later killed by a homeless man named Harold Moore, who showed no remorse for his actions.
At the time of his death, there had been no drugs in his system for several months. His mother was enraged at the Stabler family's part in her son's death and refused to see Dickie, even telling him not to come to Shane's funeral. This caused a rift to form between Dickie and the rest of his family, which in turn nearly jeopardized an unrelated rape case Stabler had been investigating. (SVU: "Turmoil")