Police say 18-year-old Brandon Machetto often fought when his grandmother, Syliva Schmitt, urged him to take medication he required.
However, neighbors were shocked when they saw him dragging a bag with bloody feet hanging out, into a van.
Deputies in Pasco County say Machetto killed Schmitt inside her home in the nudist colony, then drove around with her body inside the van.
When officers tried to stop the van, Machetto kept driving. He eventually headed back to his grandmother's neighborhood where he was arrested.
Witnesses say the teen was quiet and expressionless as he was taken into custody. Police say Machetto hasn’t spoken to them since he was arrested.
Ronnie Hall is Machetto’s former martial arts instructor. He told the Tampa Bay Times Machetto changed after being attacked and beaten several years ago. He said a brain injury suffered at that time made an average teenager become aggressive.
Machetto is being held without bond and charged with first-degree murder.