(Winchester, IN)--A hearing is set to take place Thursday morning in the case of a Randolph County man accused of killing his own two-year-old son. It was two and a half years ago that Zaydon Gray died. Investigators say his biological father, Joshua Null, struck the boy multiple times causing his death. Null was originally charged with murder. The young boy’s family members this week are campaigning to keep the charges from being reduced to involuntary manslaughter.