LAVAL, Que. -- A Quebec jury has found Adele Sorella guilty of second-degree murder in the deaths of her two young daughters, Amanda and Sabrina.

The girls were found dead in the playroom of the family home on March 31, 2009, lying side by side in their school uniforms.

It was the second trial on the charges for the 53-year-old Sorella.

In 2013, she was found guilty of first-degree murder, but the verdict was overturned in 2017 when the Quebec Court of Appeal ruled the judge had erred in her instructions to the jury.

The girls' bodies showed no signs of violence, and the cause of death was never established, creating a mystery around the case that possibly complicated the jury's task.

A pathologist testified that a hyperbaric chamber in the house used to treat Sabrina's juvenile arthritis was a possible cause of death by asphyxia. The 12 jurors were sequestered last Wednesday, with the verdict coming after six days of deliberations.