A man died from second and third-degree burns days after his girlfriend, who also was his former sister-in-law, doused him with gasoline, authorities said.

Karianne Cregar threw the gasoline on A.J. Cregar, 33, after the two fought about his alleged drug use Saturday, Volusia County authorities said. A.J. Cregar died shortly before 5 p.m. Tuesday at Shands Hospital.

"I watched my baby brother die today," said Scott Cregar, 42, of Holly Hill. "Nobody deserves that."

Karianne Cregar, once married to her boyfriend's brother, Charles, dumped a small container of gasoline on A.J. Cregar and in an attempt to ruin crack cocaine he had in his pocket, according to a police report. She told investigators she did not see a lighter and cigarette that he was holding.

Charges of battery/aggravated domestic violence and arson are likely to be upgraded. Karianne Cregar has been released on $10,000 bond.

Before learning about the death, Karianne Cregar was "very shaken" by the incident, according to her attorney, Bruce Johns.