Kashoggi accidentally OD'd by a sedative gun malfunction during extraction attempt
RT interviewed Aimen Dean, a former MI-6 intelligence source that said Khashoggi was an SA intel asset from 1993-2013 (originally working Bin Laden to bring him back) and they were trying to extract him from Turkey against his will. The sedative gun malfunctioned causing a fatal overdose.
His fiance is a Turkish foreign ministry researcher and Khashoggi had been meeting with Turkish and Qatari intelligence the last two months which had them worried.