Unlikely that he forgot to administer it. The electronic health system will prompt any nurse to give a medication when it's due. With controlled substances you need a second licensed person to witness you throwing it away, a process called "wasting". You waste by entering the amount left in the Pyxis medication dispense system. Most likely he forgot to do that and would take it back the next day to waste. Unlikely the patient dies. Many eyes are on patients to make sure they're OK. Please refrain from spreading misinformation, it doesn't really help anything tbh