Psychiatrists for the prosecution and defense testified in March that Schlemmer became concerned and even obsessed with the idea that her two youngest sons were autistic and would never grow up normally, even though a battery of tests she put them through showed they did not have a disability.
Schlemmer met her husband, Mark, on a Christian singles online dating site. She has said she felt "pressured" to have more children as her husband opted not to use birth control for religious reasons.
Schlemmer also had three miscarriages and came to feel her younger sons, especially Daniel, were "foreign" to her and her husband and not as easy to raise as their oldest boy, according to Dr Bruce Wright, the prosecution's expert.
Schlemmer drowned the younger boys after taking her oldest son to a school bus stop on April 1, 2014.
She had acknowledged trying to kill Luke and Daniel in April 2013 by tying their hands and feet with twine and backing over them with her car three times, but then claimed it was an accident.
Police and social workers also determined it was an accident.
Schlemmer told her husband days before the drownings that she wanted to confess to that crime, but he talked her out of it, prosecutors said.
- AP
