The assault happened at the Sleep Cheap motel on 1999 West North Temple in Salt Lake.
The guard was talking with a driver in a grey van that was not registered with the motel... That's when a female, exited the van and stabbed the guard in the back before driving away.
Police are on the lookout for the suspect- A white female, 45 years old, weighing about 175 pounds with mid-length blonde hair.
They are also looking for the driver- A black male in his mid 30's, standing about 5 feet 8 inches tall.
The stabbing victim is in serious, but stable condition.