A woman who threw her autistic six-year-old son off a bridge on the Oregon coast has pleaded guilty to murder and was sentenced to life in prison with the possibility of parole in 25 years.
Police said Jillian McCabe of Newport called 911 in 2014 to report she had thrown her son from the Yaquina Bay Bridge, an arch bridge that rises 40 metres above the water.
Emergency crews searched for hours before the body of London McCabe was found about two kilometres from the span.
Hundreds of people attended a candlelight vigil for the child.
Court records from Lincoln County show a plea hearing was held on Monday.
"The fall did not kill London. He suffered broken bones from the impact of the fall and ultimately drowned," Lincoln County District Attorney Michelle Branam said on Tuesday.
Prosecutors had kept many details of the case secret ahead of an anticipated August trial. McCabe accepted a plea agreement and was sentenced on Monday, allowing Branam to reveal more information about a case that drew national attention.
Relatives said after McCabe's arrest that she struggled with mental illness while trying to care for London and for her husband, Matt McCabe, who was ailing from multiple sclerosis.
But Branam said the killing was done with much calculation, and she believed McCabe faked symptoms of mental illness, such as hearing voices, whenever it suited her purpose.
The prosecutor said McCabe was concerned for her lifestyle after her husband's condition forced him to give him up good-paying work. She wanted to escape responsibility by living at the state mental hospital.
In the weeks before killing her son, McCabe did extensive internet research on ways to murder the child and how to get away with it by using an insanity defence.
"She searched stabbing, drowning and dropping from a 133-foot fall, the exact height of the Yaquina Bay Bridge," Branam said.
She also searched "Andrea Yates" more than 60 times on her phone. Yates is the Houston, Texas woman who was committed to a state mental hospital after drowning her five children in a bathtub in 2001.
Matt McCabe filed for divorce after the crime.
"I can't say enough about this boy," the ex-husband said on Tuesday. "He was my pride and joy. He was the centre of my attention; his loss leaves a black hole in the centre of my life.
"If you know an autistic individual, he needs love, too. Maybe more than you and I."
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