FRANKLIN, Wis. (CBS 58) -- Police in Franklin are investigating after an autopsy showed a woman died as a result of synthetic cannabis that contained rat poison. 

According to a release, Franklin Police and members of the fire department responded to a rescue call for a woman around 1:30 a.m. on July 1. The woman was taken to an area hospital where she was later pronounced dead. Following the death, the Milwaukee County Medical Examiner's Office conducted an autopsy. 

On Thursday, July 31, the Milwaukee County Medical Examiner's Office confirmed that one of the contributing factors in the woman's death was synthetic cannabis or K2, which contained rat poison. 

Health officials with the Milwaukee Health Department have warned against synthetic marijuana as it can cause severe bleeding, unexplained bruising and even death. 

Anyone with information about the death is asked to call police at 414-425-2648.