A 20-month-old girl found stabbed and burned inside an oven at a home in Mississippi last week was still alive when her grandmother allegedly stuck her inside, an autopsy report revealed.

Royalty Marie Floyd died “from sharp stab wounds and inhaling the heated air in the oven,” according to the coroner’s report,

The grandmother, identified as 48-year-old Carolyn Jones, was charged with first-degree murder and held on $500,000 bond. At the time it was unclear to investigators what led to the toddler’s death.

Bolivar County Sheriff Kelvin Williams said Jones’s brother found the body and called police in Shaw, a town of about 2,000 people approximately 100 miles northwest of Jackson.

“This is one of the most horrible things I’ve seen in doing law enforcement,” Williams, with 26 years on the job, said of the killing. “The hardest part is to see a child victim.”

The child was found inside a beige frame house in the north end of Shaw. Police tape still surrounded part of the house, while a stroller, high chair and trash barrel of toys, including a scooter, sat near the curb outside the house. Williams said the toys had belonged to the child.

Officials said Floyd lived at the home with Jones, while the toddler’s mother, Veronica Shant’e Jones, lived elsewhere.

“Royalty Marie Floyd was the best thing that ever happened to me,” Veronica Jones wrote on Facebook. “She’s my one and only daughter. My first love. The hardest thing that I ever had to go through in my life. My heart has been ripped from my chest.”