The trial of the double murder of Edward Downey, accused of killing Calgary's mother and her 5-year-old daughter

At the jury trial, a Calgary man accused of killing a mother and her five-year-old daughter found graphic and disturbing details.

Edward Downey is charged with the first degree murder of Sara Baillie and her daughter Taliyah Marsman.

The trial began Monday with the prosecution 's findings before a jury of five men and seven women.

Crown Attorney Carla MacPhail told the jurors that Sara and Taliyah were aware of the relationship with Downey. He was Sara's boyfriend.

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A double murder trial is underway for Edward Downey, accused of killing Calgary's mother and 5-year-old daughter

The identity of this woman is protected by a ban on publication imposed by the court and can only be designated by the initials "AB".

According to the Crown, Downey killed Sara because she was trying to break the relationship between AB and help her stay away from life as an escort.

WATCH OUT: Friends and Friends Remember Sara Baillie and Taliyah Marsman on the Occasion of the Anniversary of the Murders

Sara's body was found in her basement suite in northwestern Calgary on July 11, 2016. She was crammed into a laundry basket and hidden in Taliyah's closet, the court said on Monday.

"Tape was wrapped around Sara's head, face and neck," MacPhail said.

The Court heard that Sara's wrists were tied and that her neck, face and body were bruised.

MacPhail stated that fingerprints had been found on tape that bound Sara.

"They were made by Mr. Downey's left index," said MacPhail.

An autopsy revealed that she had died of asphyxiation.

WATCH: Trial begins for man accused of killing Calgary mother and daughter

After the discovery of Sara's body, an Amber Alert from Alberta was activated for her missing daughter.

MacPhail said that a Calgary police badyst had used pings from the cell tower to map Downey's movements.

It is a map from this data that led the police to find Taliyah's body three days later, just outside the city limits.

His tiny body was thrown into bushes.

The Crown said that was their theory. Taliyah's badbadin took her and murdered her because she witnessed her mother's death.

The trial is scheduled for three weeks.