Severus suffered terrible remorse when Voldemort decided that Harry Potter was the subject of the prophecy, and that Lily was now in danger as a result of his actions. He begged Voldemort to spare her in exchange for the lives of her husband and son. He also approached Albus Dumbledore to ask for his help in saving Lily. Dumbledore agreed, but insisted that Severus serve him as a spy among the Death Eaters. Severus secretly defected from the Death Eaters and joined the Order of the Phoenix, under Dumbledore. When Voldemort went to kill the Potters, he did give Lily a chance to step aside, but when she didn't, he killed her anyway. When Severus learned of Lily's death, Dumbledore persuaded Snape to help him protect Lily's son Harry, reasoning that it was the best thing he could do for her. Snape then dedicated the remainder of his life to protecting Lily Potter's son, Harry Potter, the boy who was often said to strongly resemble James, the very man he detested. Distrusted for his past as a Death Eater by those on Albus Dumbledore's side, and hated by other Death Eaters for living as Dumbledore's stooge for 10 years, Snape continued living on to complete Dumbledore's plan to protect Harry and defeat Voldemort. Lord Voldemort was eventually reborn in 1995, with the help of Peter Pettigrew and Barty Crouch Jr. Snape went to the Little Hangleton Graveyard, where Voldemort was waiting, but he delayed a few hours, "managing not to be suspected by Dumbledore". In fact, he became a double agent again, and a member of the second Order of the Phoenix.