The judge in the Lindsay Clancy case has declared a mistrial after the jury was unable to reach a unanimous decision.
Clancy was on trial for the murder of her three children.
She pleaded not guilty by reason of insanity.
It is now up to prosecutors to decide whether they will take the case to trial again.
Background
Lindsay and Patrick Clancy had three children and lived in their family home in the U.S. state of Massachusetts.
She worked as a nurse, while he worked in software sales at Microsoft.
On the evening of 24 January 2023, Patrick returned home from picking up takeaway for the family to find Lindsay in the backyard.
He said Lindsay had tried to die by suicide.
He called emergency services.
Patrick said he found their three children in the basement.
Two of the three died that night, and the third died in hospital days later.
Lindsay was hospitalised and is now paralysed from the waist down.
Her legal team does not dispute that she killed her children.
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What is in dispute is whether she should be held criminally responsible.
They argue she should be found not guilty by reason of insanity due to postpartum psychosis (PPP).
PPP is a rare but severe psychiatric emergency marked by mania, hallucinations and paranoia.
It has been linked to an elevated risk of suicide and infanticide.
In the months before the killings, multiple doctors prescribed Lindsay 13 different medications for her symptoms.
Mistrial
On Friday, local time, the judge declared a mistrial.
This came after the jury had sent at least three notes to the judge during their deliberations to say they were unable to come to a unanimous decision.
Kevin Reddington, Clancy's lead defence lawyer, said the jury's note indicated they were split 11 to one, with the majority believing she should be found not guilty.
Now, it is up to the prosecution to decide whether there will be another murder trial for Lindsay Clancy.
The lead prosecutor, Timothy Cruz, has said they will not decide immediately.
If this story has raised issues for you, help is available 24/7 at Lifeline on 13 11 14.
If you're a parent and you think you might be experiencing postpartum depression, you can call Perinatal Anxiety & Depression Australia (PANDA) seven days a week on 1300 726 306.
