Morticians Never Die, they just Rub Away

The lead mortician at a hospital known for its hospice care of terminally ill cancer patients is responsible for handling the deceased.  He is old school meaning he does not wear gloves when going to collect the bodies; it is considered a sign of disrespect to the patients and their families. Currently, the hospice patients are more frequently than not treated with patches of fentanyl to ease the pain once they enter care. The first thing the mortician does prior to washing the body prior to embalming is to remove the fentanyl patches. On a particularly busy day, after the fourth hospice patient is prepared at the funeral parlor, our lead mortician develops respiratory distress and suddenly slips into cardiac failure. His co-workers rush him to the ED where he undergoes CPR and is ultimately intubated and treated for fentanyl overdose. He recovers fully. But from now on he prepares the dead with gloves. At what level is the tip of the endotracheal tube placed to effectively restore respiration?

Which site indicates proper location of an endotracheal tube?