An Edmonton courtroom heard tapes Monday of three 911 calls that were made the night 16-year-old Josh Hunt died.

Hunt was stabbed in the heart at a house party in October 2006.

A young man, who was 17 at the time, is charged with second degree murder. He cannot be named under the Youth Criminal Justice Act. He has chosen to be tried by judge alone.

The 911 calls were made by the accused and his brother that night, the court heard.

"Someone's in the house with a knife …," the accused is heard screaming into the phone.

"Calm down. Calm down, OK?" the operator says. "Is he threatening anybody?"

"He's threatening me," the teen replies. "He say[s] he's going to kill me in my house."

The teen then becomes frantic and keeps pleading with the operator to send police.

"Send someone now!" he says.

"I get it. I get it," the operator says. "I'm trying to get some info on you."

The mother of the teen is heard on one of the tapes trying to calm her son down.

"They're holding the knife to me, Mom," he shouts. "I'm going to kill these mother----s."

"No, you're not. No, you're not," she replies.

The young man's mother also testified on Monday about the chaos at her house that night, saying it felt like her family was "under assault."

The woman told the judge she woke up at 2 a.m. to the sound of her oldest son screaming on the phone to a 911 operator.

When she went downstairs, both her sons were trying to hold the door to the basement door shut while people were kicking and pounding on the other side of the door. The accused was bleeding, she said.

The people in the basement were able to punch through the door, the woman testified, and that's when her son grabbed a knife from a kitchen cupboard.

Five minutes later, the mother and her two sons barricaded themselves in an upstairs bedroom.

They called 911 again to tell police Josh Hunt had been stabbed, and that he was lying on the couch bleeding.

When asked by the operator who stabbed Hunt, the younger son said his brother had gone "pretty crazy, and he grabbed a knife and started going at him."

Seconds later, however, he tells the operator he doesn't know who stabbed Hunt.

It took police 20 minutes to arrive at the house. Hunt was pronounced dead at the hospital. He died from a stab wound to the heart.

The mother is expected to be cross-examined on Tuesday.