. >> reporter: dennis thompson senior remembers hi b the many attributes they got from their parents. >> kindhearted like my mother, a little arrogant sometimes like my father. but all in all he was a good guy. >> reporter: yet dennis is quick to acknowledge that kenneth had a trouble past. >> he did bad past in his life, he was hanging were the wrong crowd he was starting to turn his life around. >> reporter: on friday march 21, 1986, police were called to the area of 6th and jefferson streets in north philadelphia. it was just before mid night when they found kenneth suffering from a stab wound to the chest. his family says he had been robbed. >> they said when the ambulance got there all his pockets were turned inside out. and his chain was off his neck and his ring was gone. >> reporter: dennis was able to describe two of the items that were taken. the chain and the watch. >> he had a gold chain and a dog tag that said kenny on it with a diamond in it. and it was on a rope chain and he had a watch, a bulova, a 10 carat gold watch. >> reporter: witnesses describe someone fleeing th