michelle heale of tom 's river , new jersey is on trial for murder in the death of 14-month-old mason hess .
heale was babysitting mason while her husband michael and mason 's father adam worked together as police detectives .
she claims she was burping mason hess when he began choking on his applesauce and that his neck snapped when she took him of her shoulder .
heale broke down demonstrating the incident to the jury .
medical examiners determined that mason died as a result of homicide caused by blunt cerebral trauma .
heale is out on bail during the trial and still has custody of her twins , who were 3 years old when the incident occurred .