The lawyer for Adele Sorella, a Quebec mother accused of killing her two daughters, is questioning the work of investigators who analyzed the crime scene.

Adele Sorella took the stand in her defence, recounting to the jury how her life took a turn following surgery to remove a brain tumour, which left her with physical disabilities and began her on a path to mental illness.

Simon Lefevbre appeared in a Laval courtroom Wednesday where he was charged with several offenses including dangerous driving causing death, criminal negligence causing death and impaired driving.