Police are trying to determine how a man's body could have gone unnoticed for nearly three days in the toilet of a Hungry Jack's restaurant.
Officers were called after the body was discovered in a locked cubicle at the Hungry Jack's on Wanneroo Road in Westminster, in Perth's north, on Monday morning, news.com.au reported.
Police believe the man might have entered the toilet on Friday night and his body remained in the toilet all of Saturday, when the store was open for 24 hours, and Sunday.
The restaurant was closed by workers at 10pm on Sunday before the body was discovered by employees at about 9am on Monday.
Firefighters were called at about 10am to forced open the cubicle, which had been locked.
If the man's body had been there since Friday, that would indicate the cubicle wasn't checked or cleaned on Friday evening, all of Saturday and Sunday.
A WA Police spokeswoman said the man's death was not being treated as suspicious. It's believed the man may have died of a heroin overdose.