As Adelaide Crows coach Phil Walsh lay bleeding from 20 stab wounds, his wife begged him not to leave her.

Meredith Walsh called triple zero after the early-morning attack at the family’s Adelaide home on July 3 last year and as she pleaded for help, she also called out to her husband, court documents show.

“Don’t die,” she said.

“No Phil, please don’t leave me. Phil, please don’t leave me.”

Minutes earlier Meredith had heard her son, Cy Walsh, trying to enter the house.

Though she opened the door for him, he walked around the back of the house.

Once inside, Cy pushed passed her and it was then she realised he was carrying a knife.

She screamed to warn her husband but he was still in bed when his son inflicted the first injuries.

“Phil sort of got up and tried to defend himself but there was blood everywhere,” Meredith said in her statement.

A post-mortem examination showed the 55-year-old former Crows coach suffered stab wounds to his chest, neck, face and arms.

The fatal wounds were to his left lung and aorta which resulted in significant haemorrhaging.

In the Supreme Court on Wednesday, Cy Walsh was found not guilty of his father’s murder due to mental incompetence. The 27-year-old will now spend his life under psychiatric supervision.

Cy Walsh (left) was left shattered by the death of his father Phil Walsh (right).

Meredith said not enough was known about their son’s mental illness.

“My heart remains broken,” she said in a statement read in court.

“My daughter is also shattered.”

But she said she would not abandon her son.

“I will continue to love and support my son as his father has always done.”

Court documents reveal Cy Walsh had struggled for years with mental health problems, which started in 2011 as he was backpacking around the world.

Phil Walsh addresses Crows players in April, 2015. Photo: AAP

He was admitted to the Graylands psychiatric hospital in Perth in May 2014 after a psychotic episode.

The court documents reveal Cy Walsh thought there was a “dark parasite” inside his father and that his father was “the devil”.

Documents also revealed Cy Walsh sent a chilling text message to his father shortly before he stabbed him to death.

“It is your duty to pump up your troops,” the message read.

“But honesty is the key.

“War needs to be a thrill . . . war can be fun . . . war should not focus on brutality.

“If Phil Walsh should fall . . . the Crows will experience many years of darkness.

“I cannot forgive your sins . . . there is a master in Peru who can.

“Please focus on hope . . . and remember to put your family before yourself.”

-with AAP