FBI: 'No Foul Play' Involved in Mammoth Cave Death

FBI officials say they think no foul play was involved in the death of a woman found in Mammoth Cave National Park.

News outlets report the body of 23-year-old Mariah Amber Decru was discovered in a cemetery on park grounds in March.

Investigators said they had determined the cause of death to be related to "acute diphenhydramine intoxication." In other words, she ingested too much of an antihistamine used in certain types of allergy and sleep medications, like Benadryl and ZzzQuil. The manner of death is listed as "undetermined" but authorities say no foul play is suspected.

Park rangers called in the FBI because the body was found on national park property.