All six of the victims were found face down in their beds with no signs of a struggle. The police investigation concluded that the rifle had not been fitted with a sound suppressor and found evidence of sedatives having been administered. DeFeo admitted during his interrogation that he had drugged his family. However, the autopsy report indicated otherwise, per the doctor, "We did extensive toxicology not only on the blood and urine but on all of the organs that we removed and it turned up zero that there wasn’t anything in their body," Dr. Adelman explained.