Images of a man detectives want to speak to in connection with the killing of a pensioner in Southampton were projected onto buildings in the city today evening in an effort to solve the case.
Hampshire officers turned to technology to help identify a "significant witness" in the hunt to find who murdered 85-year-old Delia Hughes.
Police are also using bluetooth mobile messaging and screenings before feature films in cinemas to try and find Ms Hughes's killer.
Ms Hughes was found dead on August 18 by relatives at her ground-floor flat in Atlantic Close, Ocean Village, Southampton.
Up to 60 officers are working to find the killer who bludgeoned Mrs Hughes to death with a blunt instrument.
CCTV footage of a hooded man aged between 20 and 30, seen in the area of Ms Hughes's flat at the time she could have been killed, has been circulated but the man has not been found.
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