Mississippi authorities investigating death of 19-year-old woman who was set on fire

This undated photograph released by the families of Jessica Chambers and her sister Amanda Prince, shows Jessica Chambers taken in Courtland, Miss. Mississippi authorities have launched a homicide investigation into the death of the 19-year-old woman who was found badly burned on a road near her car that was on fire in Panola County, Miss. Chambers was doused with a flammable liquid and set on fire Saturday, Dec. 6, 2014, said Panola County Sheriff Dennis Darby. (AP Photo/Chambers-Prince Families) (The Associated Press)

This undated photograph released by the families of Jessica Chambers and her sister Amanda Prince shows Jessica Chambers taken in Courtland, Miss. Mississippi authorities have launched a homicide investigation into the death of the 19-year-old woman who was found badly burned on a road near her car that was on fire in Panola County, Miss. Chambers was doused with a flammable liquid and set on fire Saturday, Dec. 6, 2014. said Panola County Sheriff Dennis Darby. (AP Photo/Chambers-Prince Famili (The Associated Press)

This undated photograph released by the families of Jessica Chambers and her sister Amanda Prince shows Jessica Chambers and her father Ben Chambers taken in Courtland, Miss. Mississippi authorities have launched a homicide investigation into the death of the 19-year-old woman who was found badly burned on a road near her car that was on fire in Panola County, Miss. Chambers was doused with a flammable liquid and set on fire Saturday, Dec. 6, 2014, said Panola County Sheriff Dennis Darby. (AP Photo/Chambers-Prince Families) (The Associated Press)

Mississippi authorities have launched a homicide investigation into the death of a 19-year-old woman who was doused with a flammable liquid and set on fire.

Panola County Coroner Gracie Gulledge says the cause of death was thermal injuries. Gulledge was hoping to final autopsy results late Tuesday. Authorities say initial autopsy results reveal Chambers died from burns that covered 98 percent of her body.

District Attorney John Champion says investigators were questioning several possible witnesses and reviewing Chambers' cellphone data.

A passerby called firefighters who found her body Saturday near her burning car near Courtland.

Darby says detectives were working to learn who the woman may have been with before her death.