DETROIT (AP) _ A man who was missing for five days after failing to show up for a medical appointment was found dead in a hospital stairwell, police said.

Melvin Montack, 68, of Detroit was scheduled for treatment Thursday at St. John Northeast Community Hospital. A hospital housekeeper found his body Tuesday on a stairwell landing between the first floor and basement.

He had been dead about four days, authorities said.

Foul play is not suspected.

Hospital spokesman Greg Jakub would not comment on how the body could have gone so long without being discovered. Police said air conditioning may have masked the smell of decomposition.