An inquest into the death of Charlie Warrender, from North Thoresby, has heard that traces of heroin were found in his body.
Royal Navy engineer Mr Warrender, who was in his early 20s, was found dead in the Seychelles on Saturday, May 30, while on active service on Portsmouth-based HMS Richmond.
Local police launched an investigation into Mr Warrender’s death, which was regarded as suspicious as he was found with a head injury.
Toxicology tests later found traces of heroin in his system.
The inquest opening, which took place in Cleethorpes on July 30, heard that Mr Warrender died from the combined effects of alcohol and heroin intoxication.
Senior Coroner for North Lincolnshire and Grimsby, Paul Kelly, is now awaiting reports from Seychelles Police and the Royal Navy who have interviewed crew members before the inquest – which has been adjourned – can continue.
A Royal Navy spokesperson told the Leader: “The Royal Navy undertook an Immediate Ship’s Investigation (ISI) into the circumstances surrounding this incident.
“The purpose of the ISI was to review the ship’s leave and security policy at the time of the incident. This was not an investigation into ET Warrender’s death, for which the Seychelles Police have primacy.
“Therefore, the ISI did not inquire into, assess or analyse any matters or material which may prejudice the findings of the Seychelles Police investigation.
“A review of the ISI is now being carried out to determine if there are any immediate lessons that should be identified.”