A New Jersey father who was convicted of aggravated manslaughter and endangering a child in the death of his 6-year-old son was sentenced to 25 years in prison on Friday.

Christopher Gregor, 31, was captured in a shocking video played in court that showed him forcing Corey Micciolo to run on a treadmill at high speed. The boy died on May 31 of injuries related to his fathers abuse.

Surveillance footage from March 20, 2021, played during Gregors trial, shows Corey repeatedly struggling to stay on top of the moving belt of a treadmill. The boy falls on his face and his back six times as his father continues to force him back on the treadmill. At one point in the footage, Gregor seems to be biting his sons head, HuffPost previously reported .