RIMOUSKI, QUE. -- A jury on Friday night found a 22-year-old man guilty of second-degree murder after his brother was fatally stabbed through the head and heart.

The jury of 10 men and two women also declared Tobby Carrier guilty of attempting to murder his mother and father in the town of Matane Que., about 400 km northeast of Quebec City.

Court heard that on the night of March 31, 2009, Carrier, then 19 years old, repeatedly stabbed his parents before stabbing his brother, Ismael, to death.

During Carrier's trial, a pathologist told the court that the knife penetrated 18 cm into Ismael's heart and almost sliced the vital organ in two.

Carrier's mother, Chantal, showed no emotion in the courtroom when the verdict was read. Carrier's father, Nelson, was not in attendance.

Carrier told the court during his trial that he was not in control of his body the night he murdered his brother.

"My body seized the knife," he said. "My body decided."

Carrier is due back in court on March 18.