India, Sept. 25 -- The state autopsy of 18-year-old Nolan Wells has found that his cause and manner of death are "undetermined," while a private investigation into his phone has raised new questions about what happened before and after his death.

Wells went missing after a July 4 boat trip with friends to Horn Island in Mississippi. His body was found in the water on July 6.

The family of Nolan Wells on Thursday released the Mississippi State Medical Examiner's autopsy report. It found that the cause and manner of death are "undetermined."

"This 18 year old male was found face down in the water at Horn Island. Because the circumstances surrounding this death are unknown, the cause and manner of death are best classified as undetermined...