Police have identified a 53-year-old man found in unresponsive in a snow-covered parking lot as Kevin Harvey of Lincoln.

Harvey was pronounced dead at a hospital after a worker clearing snow from the business lot found him around 3:40 a.m. Friday. Efforts to revive Harvey at the lot and a Lincoln hospital failed.

The Associated Press reports that some of Harvey’s friends think he was on his way back to the Curtis Center at the People’s City Mission when he collapsed in the lot.

Lincoln police spokeswoman Katie Flood says there were no signs of physical injuries to Harvey.

It’s unclear whether he was a victim of weather exposure or of some other medical problem.