Police found the body of the 51-year-old man early Wednesday morning.
Authorities say the man's family reported him missing Tuesday night after his dog came home from a walk without him. Police searched overnight and found the man floating in a park pond around 6:30 a.m. Wednesday.
The Whitman County coroner has tentatively ruled the death an accident and police say there is no suspicion of foul play.
The man's name was not immediately released but he was reportedly a history professor at Washington State.