A 46-year-old man was declared dead in Milwaukee, Wisconsin, on May 19.
According to WISN 12 News, the man's worried girlfriend could not get a hold of him at his apartment, was concerned because he had a medical condition and called 911.
A police officer responded, found the man collapsed and called for paramedics.
According to an investigation report, "(Firefighters) found him cold to the touch and in rigor ... They did not attempt to resuscitate him ... Death was pronounced at 1410 hours (2:10 p.m.)."
The firefighters called the medical examiner's office, which in turn called a transport crew to pick up the body.
About an hour later, when the man was about to be moved to a morgue by the transport crew, he started moving his right leg and arm, and began breathing.
The transport crew team called 911, the firefighters returned and took the man to Columbia-St. Mary's Hospital Intensive Care, noted ABC13.com, where he remains.
It's not clear why the transport crew didn't transport the man to the hospital.
Milwaukee Fire Department Assistant Chief Gerard Washington told WISN 12 News, "We're doing an internal investigation to make sure that everything we did followed protocol. It's an active investigation, so I can't comment in detail."