HOUSTON (AP) — A family of six children and two parents were fatally shot in the head at a Houston home by a man with a violent criminal history who had previously been in a contentious relationship with the mother, authorities said Sunday. David Conley, 48, was charged with capital murder in the deaths. Most of the victims had been handcuffed and some had been shot multiple times, said Sgt. Craig Clopton, the lead investigator for the Harris County Sheriff’s Office.