A woman was found dead on Sunday after taking an overdose of pills, the Washington State Patrol said.

The victim was found by a resident of a home on the 300 block of North Park Street in Olympia, about 20 miles north of Seattle, on Sunday morning, said Trooper Mike Anderson.

The cause of death has not been determined, but investigators believe it was a drug overdose, he said.

The victim was not immediately identified.

The woman was a resident at the home, and the investigation is ongoing, Anderson said.

Police did not release the names of the woman’s neighbors.