My theory is that GCHQ learned of the plan to kidnap K and instead of warning Trump, it informed the Deep State who infiltrated a MB mole into the 15-man Saudi squad and who had orders to assassinate K before he could be brought back to the KSA to be interrogated about his role in the attempt to assassinate MBS in Las Vegas, among other things. This mole injected (covertly) or strangled K during the scuffle. Everyone then panicked and the body was disposed of. The squad was interrogated back in the KSA except for the DS/MB plant who ran and was killed in a mysterious "car accident" in Riyadh, likely killed by the MB before he could link the murder to the DS/MB. (((They))) then blame it all on MBS and Trump in yet another soft coup attempt which is on-going as I type.
https://www.zerohedge.com/news/2018-10-18/khashoggi-murder-suspect-dies-suspicious-car-accident
https://www.express.co.uk/news/world/1037378/Khashoggi-murder-news-saudi-arabia-chemical-weapons-use