Can a Moray Eel kill you?

no, they are not considered dangerous.

Another view

They can and have given Scuba Divers/snorkelers nasty bites. Usually because the human has poked around where the moray was hiding.

Moray eels are comparable to cats in a way. When threatened, they can inflict painful bites. However, they do not mind human presence and are relatively docile when handled gently.