The remains of a girl have been discovered in a plastic container covered in concrete four years after she is believed to have died in Everett, Washington.

The body of the 4-year-old was kept at home and covered in concrete to control the smell, relatives told police according to the Mirror.

Police believe the girl's mother and her then-boyfriend had a history with law-enforcement and panicked when she died.

Q13 Fox reports that instead of reporting the death, the couple wrapped the girl's body up and put it in the container.

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Police found the body after executing a search warrant on Saturday.

Cause of death was yet to be determined and no arrests have been made.