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A 13-year-old killed his own mother after a failed attempt to rape her in a row over a ban on the Call of Duty video game, a US court heard.

The jury in the murder trial of Noah Crooks heard a disturbing 911 call during which the teenage accused, from Iowa, can be heard pouring his heart out about the killing.

Crooks, now 14 , has been charged with first-degree murder and assault with intent to commit sexual abuse on March 24, 2012.

The victim was his 37-year-old mother, Gretchen Crooks, who had taken away his “Call of Duty” video game because he got bad grades in school, it was said.

The court heard Crooks admit that it was because of the game being taken away that he snapped.

In the 911 recording made on the night of the murder at the family's home in Osage, Iowa, Crooks can be heard telling the operator: “I’m not joking at all. She’s dead. I’m scared. I killed my mom with my .22. I don’t know why I did it.”

Police responding to the call found the woman shot multiple times, according to Mitchell County Sheriff's Office.

During the conversation, which lasted about 10 minutes, the boy repeated his confession several times The Global Gazette reported.

Crooks said: “I feel crazy and I know I'm not. I think I have some form of ADD.

“I tried to rape her. I tried to rape her but I couldn't do it.

“Who tries to rape their own mom? My life is down the drain now.”

He went on to say: “I just wish it was a dream so I could wake up and I could kiss her and hug her.”

Noah rambled on about his mother making him homemade doughnuts earlier that night and expressed disbelief that he killed her after she did that for him.

He then revealed that his mother had taken away his Call of Duty video game because he got bad grades in school, and that is when he snapped.

He told the 911 operator: “Something just came over me.”

(Image: Facebook)

The boy then spoke about having to move away and giving up on his dreams of getting into a good college and marrying his eighth-grade girlfriend.

On the first day of Crooks' trial on Wednesday, jurors also heard testimony from Mitchell County Sheriff’s Deputies Jeff Huftalin and Greg Halbach, who described the crime scene, WCF Courier reported.

Gretchen’s bullet-riddled body was found stretched out on a coach.

Her pyjama top was undone and she was naked from the waist down, Halbach said in court.

The woman was not breathing.

The deputies seized the murder weapon, a .22 caliber rifle, which was lying across a chair in the dining room.

Halbach said that he slapped handcuffs on Noah's wrists and placed him in the patrol car.

He added that the teenage suspect was not crying and did not appear emotional.

Noah Crooks' attorney is not denying that his client killed his mother, but he claims that the boy suffered what he referred to as a “tumour of rage”, rendering him insane at the time of the slaying.

Addressing the jury panel, the lawyer said that a child psychiatrist will testify that Crooks suffers from intermittent explosive disorder - a mental illness marked by repeated episodes of impulsive, aggressive or violent behaviour.

Gretchen, who was listed with her husband William Crooks as the owners of the home where she was killed, had worked as a nurse at Mercy Medical Center-North Iowa while also studying toward her master's degree after accepted at the University of Iowa in 2009.

On her Facebook page back in 2010, she praised her son, one of two sons according to Mrs Brahm, for his musical talents on the saxophone as well as his accomplishment in being accepted into a University of Iowa camp to learn Chinese.

“So proud of him!” she wrote.

She had also recently published an application on her page reading: “Click "like" if you love your son!”

Her death comes as the first reported murder in the city of Osage since 1898, according to KAAL-TV.