. >> lucille cook had made dozens and dozens of atm transactions around the time of this one.he remember those and of course she could not. >> bank logs showed a 3 1/2 minute gap between the victim's card being used and lucille cook's transaction. >> that doesn't seem like a lot of time until you sit there and time it. we had the jury sit there to see how long it was. >> it was the longest three and a half minutes. >> why would the killer wait three and a half minutes? one of the jurors said they got in the jury room and laughed at her. >> now it was time for richardson to go after the state's star witness, pat cohen. after some soul searching, sean buckner agreed to testify against his old friend. >> he testified that pat koem cohen was extremely drunk that night. he had doubts about what he saw. >> patrick had told sean buckner, i feel like i'm sending an innocent man to prison. >> but richardson knew he had to answer one last question -- >> in the back of their mind, the jury is saying the kids saw something. if it wasn't your client, who was it? >> so richardson called his