After the diagnosis, he spent a summer semester undergoing intensive academic training at Landmark College, a private university in Putney, Vermont, established exclusively for students with learning disabilities. He then returned to Morehouse, where he made the dean's list when his grade point average jumped from 2.3 to more than 3.5. In his free time, he tutored students at elementary and high schools. He earned a bachelor's degree in 1992 from Morehouse, which he followed with a master's degree from Columbia University in New York in 1995. While at Columbia, he worked at Alfred E. Smith Elementary School and also tutored students struggling with learning disabilities. His friends recalled that he kept a low profile and did not want special treatment, and would just say that his father worked "in business" when asked why he had lived in three states. At the time of his death at 27, Cosby was working toward his doctorate in special education at Columbia University's Teachers College. He planned to set up a school for children with learning disabilities. He once wrote, "The happiest day of my life occurred when I found out I was dyslexic. I believe that life is finding solutions, and the worst feeling to me is confusion." Ennis was recalled as friendly and outgoing, and he would greet people with, "Hello, friend," a greeting that became his legacy. His parents had the phrase put on a sign near his grave, and several months after his death, his father released a jazz collection titled "Hello, Friend: To Ennis With Love". Cosby was in Los Angeles in January 1997 while on winter break from his classes at Columbia University. In the early hours of January 16, 1997, he was visiting friends in Los Angeles and driving north on Interstate 405 through the Sepulveda Pass when, at approximately 1 a.m., he pulled off the freeway onto Skirball Center Drive to fix a flat tire. He called his girlfriend, Stephanie Crane, who drove to meet him; she parked behind him to light the area with her headlights while Cosby changed the tire. She later testified that a man came to her window and told her, "Open the door or I'll kill you." Frightened, Crane drove away but after approximately , she heard a gunshot and turned her car around and came back. She saw a man running away and found Cosby lying on the ground in a pool of blood next to the driver's side of his dark green Mercedes-Benz. He had been shot in the head. It appeared robbery was a motive, but Cosby was still wearing a Rolex watch and had 60 dollars in his pocket.