Sankofa was found guilty of shooting Lambert in the parking lot of a Houston supermarket. He told police that he had done ten robberies that week, but did not kill Lambert. The government believed he has done as many as 22 robberies which had happened in that area during that time. One of these included Graham using a shotgun to rob a man who Graham gave a ride to when the man's car stopped working on the highway. During that robbery, the man tried to escape and was shot by Graham but he did live. While there was no physical evidence to link Graham to the murder, one woman was in the parking lot at the time and saw him do it. She said she heard the gunshot and turned on the lights of her car. She saw Graham as he started running and followed him out of the parking lot with her car. There were several other people inside the store but none of them saw the shooting. Sankofa's supporters brought his case international attention, aruging that his conviction was based on the testimony of a single eyewitness who said she saw him for a few seconds in the dark parking lot committing the murder 