Looks like it was flakka. $5 per hit and highly addictive.
"Flakka can cause a user's core body temperature to shoot up to 104 or 105 degrees and make them tear off their clothes while also providing an adrenaline boost that results in high pain tolerance and superhuman strength.
It tends to cause euphoria and hallucinations, but taking even just a little too much of the drug — which costs about
$5 a hit — can lead to
aggression, paranoia, psychosis, heart problems, and death. Also, apparently, face-eating...."
http://nymag.com/thecut/2016/08/what-is-flakka-drug-murder-suspect-austin-harrouff.html