Murders accused 'had sex with gay men after knocking them out with drugs'
A sex fiend drugged and murdered four young men he met on gay networking sites such as Grindr, a court in England has heard.
Stephen Port, 41, invited his victims to his flat in Barking, east London, where he plied them with high doses of the party drug GHB so he could have sex with them while they were unconscious, jurors were told.
