A Royal Navy sailor who was found dead from a fatal dose of heroin while taking part in a drugs operation overseas was probably “injected by a third party”, an inquest has ruled.

Charles Warrender, who was serving on the HMS Richmond in the Indian Ocean, was found dead barefoot with his shoes and socks placed next to him in the Seychelles.

His body was discovered behind the national library in the island’s capital, Victoria, on 30 May last year and his money had been stolen.

Local police said there was no evidence of foul play but his inquest heard that Warrender, whose ship was on a mission to disrupt the drug trade, was found with high-grade heroin sprinkled on his chest.