Nichols tells Celeste that, when he was studying for the priesthood, he would have studied classical Greek. He would have studied Koine Greek since that was the Greek the New Testament was written in.
The MCS captain, played by Mary Elizabeth Mastrantonio, tells her detectives that the ME is ruling the deaths as a "double murder." "Murder" is a legal term that is applied based on varying statutory degrees of intent, and would not have been applied by the coroner. The correct term would be "homicide," which means "death that is caused by another." "Homicide" can be determined by an autopsy, but "murder" would be applied by the prosecutor.