That's according to a representative with the Fulton County Medical Examiner's Office, who noted Markeesha Taylor, 20, of Decatur specifically died of "acute methamphetamine poisoning."
The representative also said Taylor's body did not display any signs of foul play
Taylor's body was found on a bank near the river just before 1:30 p.m. Sunday, May 11 at Vickery Creek Park, which is located off Riverside Road in Roswell.
While the Roswell Police Department initially responded to the scene, the case was turned over to the FBI because the park sits on federal land.
However, the case has now been returned to Roswell, and the agency has asked Taylor's friends and acquaintances to come forward with any information to help solve the case.
Roswell police are also searching for Taylor's boyfriend, Mustafa Tariq Reddick, said agency spokesperson Zachary Frommer.
Reddick, who Frommer said is also known as Tariq Smith to "most people," has written on his Facebook profile that he's called the police to have Taylor listed as a missing person, which the spokesperson said has not happened.
However, Reddick is not a suspect in this case at this time, Frommer added.