were coming from, they were able to see the lies in kevin freeman's original story. >> informant richard perkinsalso took the stand. this time his testimony was devastating to the prosecution. >> perkins admitted that one of the prosecutors put him in a room with kevin freeman before they testified at the original criminal murder trial and said, you guys get your story straight. >> perkins also admitted receiving $10,500 after thompson was convicted. >> we were able to show why perkins implicated thompson. perkins was a street kid who needed money desperately. he saw a chance for more money than he had ever seen or imagined in any one place in 1985 and he went for it. >> for the first time in 18 years, john thomson was finally able to take the stand and proclaim his innocence. >> you could hear a pin drop. i mean literally. he finally had a chance to explain to a jury why he had the murder weapon. >> john thomson's testimony was that he did have the gun, but he had bought that from kevin freeman. >> kevin freeman sold the murder weapon to an unwitting john thomson. john was involved in buying an