Updated

A trial is under way for a mother of three accused of drowning two of her kids in a bathtub, and blaming it on voices in her head.

In a video introduced to the courtroom in Pittsburgh, Laurel Schlemmer admitted to police that she drowned her sons, ages 3 and 6, back in 2014.

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Schlemmer faces charges of homicide, endangering the welfare of children and tampering with evidence.

“These crazy voices were prompting me to act irrationally,” Schlemmer said in the video. "I got in there with them and held them underwater.”

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That story was different from the original 911 call she made, according to the Pittsburgh Post-Gazette. In the call, which was also introduced into the non-jury trial, she told police she had left the kids in the bathtub, stepped out to use the bathroom, and came back to find them unconscious.

Prosecutors said this wasn’t the first time Schlemmer tried to kill the two youngest sons. They claimed she also tied them up with twine and ran them over with her van, sending them to the hospital.

Schlemmer confirmed in the confession video that she did run over her kids, but that she made up the part about tying up her kids when telling her husband.

Photos from the scene were also introduced in the trial.

Schlemmer’s lawyer said his defense would focus on her mental state.