WALLA WALLA, Wash. -

Walla Walla Police are investigating three deaths this week from narcotics overdoses.

Lab results are pending, but officials say it's likely the deaths were caused from injecting heroin that was either laced with another powerful depressant, or was in a very pure form.

Walla Walla County Coroner Richard Greenwood confirmed the overdoses Friday night. They took the lives of two 20-year-old men and a 68-year-old woman.

Police say the first reported death was a college student from another state. His body was found in his bedroom Wednesday. The other two deaths occurred Friday.

The male was a local resident and the woman had been brought to a local hospital by ambulance from Umatilla County.