. >> he described stephanie mahaney had a bugs bunny night shirt.nds started shaking. i felt i had justice in my hands and i had to do something. the first thing i did was call texas ranger johnny allen. he knew sells well, and he said that what i was telling him made it sound like it was very possible that sells killed joel. i thought, maybe someone who had more ability to get information than i did would be able to track this down. >> so she just kind of eludes to it in her book. >> anger drove him. he picked up a knife and headed straight for the first bedroom door. there, 10-year-old joel kirkpatrick dreamed his last dream. >> diane fanning publishes her book, and clearly "20/20" had to go back and look into the story again. clearly, i was going to interview tommy lynn sells. did you commit the murder of the boy in lawrenceville? thank you. ♪ if there's anything that you want ♪ ♪ if there's anything i can do ♪ ♪ just call on me and i'll send it along ♪ ♪ with love from me to you ♪ spray, lift, skip, step. swipe, lift, spin, dry. slam, pan, still