By Q Radio News
The PSNI says it believes it knows who murdered journalist Lyra McKee.
However, the man leading the murder inquiry, Detective Chief Superintendent Raymond Murray told the BBC it was incredibly difficult to prove.
29 year-old Ms. McKee died while observing a riot in the Creggan estate in April last year.
Meanwhile, the Police Ombudsman is investigating a complaint from Lyra’s family concerning the security operation on the day of the killing.

Irish President thanks Londonderry for showing ‘path from conflict to peace’
Publishing officers’ names on courts website ‘not a data breach’ – police chief
Football clubs here move a step closer to project funding
Striking criminal barristers need to meet me halfway, says Long
Chief Constable urges ‘buy-in’ for support of police service