Letter Carrier Arthur Holcomb was recently delivering mail in a Hope, AR, neighborhood when he encountered a customer in distress.
The man, who was sitting in his car with the door open, called out to Holcomb for help.
The Postal Service employee rushed to his side and found that the man was having trouble breathing.
Holcomb called 911 and performed CPR on the customer when he lost consciousness during the wait for emergency responders to arrive.
After medics took the man to a hospital, Holcomb gave a statement to police, who later informed him that the victim did not survive.