In a case as rare as it is nightmarish, police arrested a North Sacramento woman Tuesday who they said killed her 6-week-old daughter in March by burning her to death in a microwave oven.

Ka Yang, 29, was booked into the Sacramento County Main Jail on suspicion of murder and assault that resulted in the death of a child. She is being held without bail.

"It's unthinkable," said Norm Leong, Sacramento Police Department spokesman. "Everyone was stunned at the cause of death. Even the detectives were shocked."

Mirabelle Thao-Lo was found dead March 17 by firefighters called to the home in the 800 block of Rood Avenue, in the city's Robla neighborhood.

People at the scene said an adult holding the baby had suffered a seizure and dropped her, Fire Department Battalion Chief Niko King said at the time.

Fire officials summoned police because of the child's traumatic injuries, King said.

Investigators spent three months trying to determine what caused the infant's severe and unusual burns, authorities said.

"She had some really deep tissue burns, fourth-degree burns. It was probably the worst case I've seen," said Sacramento County Coroner's Office spokesman Ed Smith.

Read the full story at SacBee.com