Phoebe Judge

But the judge had to decide whether sleepwalking fell under the defense, not guilty by reason of insanity, or something else, called non-insane automatism.

The prosecution appealed and the case went to the Canadian Supreme Court.

The court used a test to determine whether a condition could be considered insanity.

Ramya Nagesh says that in many cases where someone commits a violent act while sleepwalking, they don't have any history of violence.

Today, there are experts who work specifically on what some call sleep forensics, which includes trying to identify the signs of sleepwalking.

Nine years after Kenneth Parks was first acquitted, a man named Scott Falater, who lived in Phoenix, Arizona, was arrested and charged with murdering his wife, Yarmila.

A neighbor had called 911 during the night.

He said he saw Scott Falater throw Yarmila into the pool in their backyard and hold her head under the water.

When police arrived, they found Yarmila Falater dead in the pool.

She'd been stabbed many times.

Scott was upstairs.

He said he was confused and had just woken up.

He said Jarmilla had asked him to fix their pool filter, and that the last thing he remembered was going out to try to fix it at about 9 p.m.

When he came back inside, he said Jarmilla was asleep on the couch, and that he kissed her and went upstairs to sleep.

The neighbor who'd called the police said that he'd noticed Scott Falater motioning at his dog.

The neighbor also described seeing Scott Falater put gloves on before he rolled Jarmilla into the pool.

And police found bloody clothes and a hunting knife in the back of Scott's car.

Scott Vallader's family said he had a history of sleepwalking.

But the prosecutor said he, quote, did not fit the mold of a sleepwalker.

Scott Vallater was found guilty of first-degree murder and given a life sentence.