Police found the body in the parking lot of a Haggens Grocery Store at roughly 3 p.m. Police have not released the person's identity or cause of death, but are calling it a "suspicious death."
Mount Vernon police believe the body may be related to a "shots fired" call they received Monday night at 10:30 p.m in the 300 block of Anderson road in Mount Vernon.
Officers responded to that call but didn't find anything suspicious. The next day, a man who lives in that area called police to say he had found blood in his house, which he shares with several people.
Mount Vernon police began looking for a car associated with that house and also asked Arlington police to be on the lookout for the vehicle. Police say the car they were looking for is the same car found Thursday with a dead body inside it.
A medical examiner will remove the body and Washington State Patrol troopers will tow the car to another area to process it.