The list below details the police probes currently under way.
5. ALENA
Alena Grlakova, aged 38, was found on land behind the Fitzwilliam Arms Hotel, Parkgate, on Monday, April 8 after disappearing on Boxing Day last year. An arrest has been made but nobody has been charged. D Photo: JPI Media
6. MARTIN RIGG
Martin Rigg, aged 37, died after being struck by a tram in West Street, Sheffield city centre, in May following an altercation close to Convent Walk. Two arrests have been made but nobody has been charged. Photo: JPI Media
7. UNNAMED BABY
A murder investigation was launched following the death of a nine-week old baby boy who suffered a cardiac arrest in Great Houghton, Barnsley, in November. A 29-year-old man was arrested and later bailed. Tests are still being carried out. Photo: JPI Media
8. JOHN METHLEY
John Methley, aged 39, died after an attack close to the Midland Road roundabout, Masbrough, Rotherham, in February. Two men have been charged with murder. Photo: JPI Media