Fire crews found a body inside a mobile home near Tampa after they extinguished the flames.
The incident happened early Monday in a Valrico mobile home park. Authorities weren't immediately naming the victim.
The Hillsborough County Sheriff's Office reported deputies responded to reports of a mentally ill person walking around the neighborhood with a hammer. Upon arrival, they found a mobile home on fire.
Deputies reported taking 42-year-old Frank Stanley Chapman Jr. of Valrico into custody after "utterances about setting the trailer on fire."
Chapman was charged with first-degree arson and could face other charges. He was being held on $50,000 bail, and does not have an attorney, online jail records showed.
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