"We do know the carrier delivered mail to the house that day, and he remembered seeing something he thought was related to Halloween," the postal service said in a statement.
"When the carrier learned that was not the case, he was shocked and extremely upset."
The local ABC News affiliate reported that the dead man, Dale Porch, 46, collapsed and died November 2 on his porch steps after returning home from his night shift job.
Relatives of Porch could not be reached for comment by Reuters.
The postal service called the incident "an unfortunate situation" that probably would not have happened any other time of year.
"Our carriers have a long history of assisting customers in neighborhoods across the country each and every day, and that holds true for our letter carriers here in Denver," the statement said.
The unidentified carrier is a "conscientious and dedicated employee" who remains on the job, the post office said, and any action that may be taken against him will be handled internally.
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^You sir are my hero
Mr. Porch died on the porch. Hmmm ironic is the word coming to mind.