The Maine Drug Enforcement Agency wants to find the source of the drugs that were involved in the death of a Harrison teenager who was dropped off at a Lewiston hospital Sunday morning.

The person who drove 18-year-old Cassidy Patten to Central Maine Medical Center left without telling the hospital’s staff why she was in distress.

Patten died at the hospital’s emergency room from an apparent drug overdose.

She was a 2015 graduate of Oxford Hills Comprehensive High School in South Paris. Her family and friends plan a vigil for her at the high school’s Gouin Field on Wednesday evening. The cellphone vigil will begin at 6 p.m. in the parking lot.

“Come light up the skies for our beautiful angel,” her family posted on Facebook.

Scott Pelletier, spokesman for the MDEA, said his agency is working with Maine State Police and the Oxford County Sheriff’s Office on the investigation.

“On its face it’s another tragedy involving an overdose death,” Pelletier said Tuesday evening. “She was dropped off and no one stuck around to find out what happened. That in itself is suspicious.”

He said it appears someone drove Patten to the hospital, where she was put in a wheelchair and wheeled into the emergency room.

“She was in extreme distress when she got (to the emergency room),” Pelletier said. “We strongly suspect that it was a drug overdose. Based on her symptoms, we believe it may have been heroin or some type of opiate.”

The state Medical Examiner’s Office is doing a toxicology test, but the results may not be available for several weeks.

Investigators are reviewing surveillance tape to try to identify the person who drove Patten to the hospital. They are asking anyone who may have information about Patten to contact the MDEA’s anonymous tip line (800) 452-6457 or Maine State Police at 657-3030.

Dennis Hoey can be contacted at 791-6365 or at:

dhoey@pressherald.com