He has since been allowed home, but his flat had been ransacked while he was unconscious and laptops, mobile phones, a wallet and cash stolen.Detectives arrested a 24-year-old man and a 17-year-old girl on suspicion of murder and theft on Tuesday. The man was also arrested for rape, and both have been released, pending further inquiries.The investigation is being led by Detective Chief Inspector Rob Pack, of the Met’s Homicide and Major Crime Command.DCI Pack, said: “We have linked these two incidents through our suspects and our enquiries continue to establish the exact circumstances.”We know the victim in the Walthamstow incident met the male suspect through a social networking site and we are investigating whether there is a similar connection in Mr Murphy’s death.”Both incidents happened over a short period of time and thorough enquiries have led us to make these prompt arrests.”However, there is a possibility other offences may have been committed before 30 May.”He added: “I would also be keen to talk to anyone who saw anything suspicious on the afternoon of June 4 around Lombard Road, anything that looked out of place.”On Tuesday June 4th at 6.38pm police were called by the London Ambulance Service to a block of flats in Lombard Road after the body of a man was found. “She has been released under investigation.” Police have issued a warning over a suspected dating app killer after a murder in Battersea was linked to a robbery and a rape of another man days earlier. The body of 43-year-old Adrian Murphy was found at an address on the banks of the Thames in Battersea, south London, last week and police have arrested a man and a teenage girl on suspicion of murder and theft. Tests failed to establish the exact cause of his death, but police say property had been stolen from the premises, and believe he was lured to the flat after chatting with a stranger on Grindr.Detectives are now linking the death of Mr Murphy, who lived in nearby Wandsworth, to the rape and robbery of a 40-year-old man who had invited a man he had met online to his flat 15 miles away in Walthamstow, east London, five days earlier.Police fear there may be further victims, and have asked any men who believe they may have been attacked in similar circumstances to come forward.The Walthamstow rape victim believes he was drugged by the man he invited to his flat on Thursday, May 30.He was found unconscious later that day by a pal and was rushed to hospital. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. “Officers attended and the man was pronounced dead at the scene.”Next of kin have been informed and the man has been identified as Adrian Murphy, aged 43, from the Wandsworth area.”A post-mortem at St George’s Hospital on Wednesday June 6th failed to determine a cause of death and we await the result of further tests.”Property was stolen from the premises where Mr Murphy was found.”Enquiries have linked this incident to an earlier allegation of rape at an address in Walthamstow on Thursday May 30th at around 1pm.”The 40-year-old victim believes he was drugged by a man he had invited to his flat after meeting him on a social networking platform.”He became unconscious and was found later that day by a friend who raised the alarm.”The victim was taken to Whipps Cross Hospital and has since been discharged.”His flat had been ransacked while he was unconscious and property including laptops, mobile phones, a wallet and cash, stolen.”A 24-year-old man was arrested late on Tuesday June 12th on suspicion of murder, rape and theft. He has since been bailed to attend a police station at a later date.”A 17-year-old girl was arrested earlier on June 12th on suspicion of murder and theft.