BURLINGTON TOWNSHIP - The death of a high schoolstudent whose body was found in a pond days after she went missing has been ruled a suicide by drowning, according to investigators.

Results of toxicology tests show Sarah Townsend, 18, of Florence died with "significant levels" of cocaine in her system.

On May 9, Townsend's boyfriend discovered her car abandoned next to a pond in Burlington Township. The engine was running and her cell phone and purse were inside.

Rescuers searched the pond and surrounding area for days until police divers discovered her body May 13.

AP wire services contributed to this report.