Found Dead on a Tractor

Loraine “Lori” Lynn is found slumped over a farm tractor with her head submerged in a pond on the family farm. Police say it was a tragic drowning accident. Lori’s family believes she was murdered and the death scene was staged. And they set out to prove it. The medical examiner eventually supports their theory, and the case is ruled a homicide. Who staged Lori’s death to look like a tragic accident and why?