Marcell Christopher was lying on his back, thinking he would die from the bullet in his chest, when the police officer approached him that early January morning.
"Who did this to you?" the officer asked.
Without hesitation, sources said, Christopher replied, "Cortez... Cortez Sims."
The officer's body camera captured it all.
A few hours later, though, at the hospital, Christopher said something different. He told a Chattanooga Police Department investigator multiple times he couldn't remember who burst into the College Hill Courts apartment on Jan. 7, 2015, opening fire on him and three women.
Ordinarily, a prosecutor would be struck with a flip-flopping witness and a difficult case. But now, body cameras, security footage and even social media pages give authorities another digital lever to pull in court.