Nick and Aaron Carter‘s late sister, Bobbie Jean Carter, died from a deadly drug overdose … TMZ has discovered.

Bobbie’s official explanation for demise is intoxication by the mixed results of fentanyl and methamphetamine … based on the Hillsborough County Medical Examiner in Florida.

Based on new authorized docs, obtained by TMZ, the M.E. dominated Bobbie’s demise unintentional.

As we first advised you … Bobbie Jean died two days earlier than Christmas 2023, when she was discovered unresponsive in her lavatory whereas on probation on a drug-related cost.

The Medical Examiner’s report says Bobbie Jean’s roommate had contact together with her at 6:30 AM on Dec. 23 … however shortly after, round 7 AM, the roommate discovered Bobbie Jean unresponsive on the lavatory ground and known as 911.

The docs say first responders tried life-saving measures on Bobbie Jean however they have been unsuccessful and he or she was transported to a Tampa hospital, the place, at 8:02 AM, she was pronounced useless.

Bobbie’s since been buried in Florida. She was 41.