"The fact that it was two missing kids, it just sat in my craw," said Ed Carroll, a 26-year Chicago police veteran who worked off and on for three years on the Bradley case until his retirement in 2013. "I had never worked a missing persons case before that. I didn't work another one after that, but it just bothered me. It bothered me that these two kids went missing, vanished into thin air, and we were never able to find them."