Authorities arrested a family of four Tuesday in the gruesome 2016 slayings of eight people from another family in rural Ohio, a crime that prosecutors suggested stemmed from a custody dispute. The announcement marked the culmination of a massive investigative effort that began after seven adults and a teenage boy were found shot in the head at four separate homes in April 2016. The killings terrified local residents and spawned rumors that it was a drug hit. Ohio Attorney General Mike DeWine said a grand jury indicted the four on aggravated murder charges and they could be sentenced to death...