>> i still can't imagine what happened and what transpired in those few minutes, the last few minutes of kim's life. >> if i had an officer that was doing this, i don't care who it was, it shouldn't happen. nobody should suffer and die the way kim medlin did. >> but to get a conviction, prosecutors needed to prove josh griffin was the killer. >> with not having any dna, they actually had to build their case around that footprint. >> according to personnel records, griffin was the only officer to wear a size 8 1/2 thorino-style thorogood shoe. so, ricky novarro took a new pair of these shoes, made an inked impression and compared it to the shoeprint on the back of kim medlin's sweatshirt. navarro believes it was the only one that could have created that impression.