Remembering PC Anthony Mulhall who died on 18 July, 2008, after being found on Mount Snowdon.
The officer had been cleared of wrongdoing after punching a woman while trying to arrest her.
PC Mulhall, of South Yorkshire, died in hospital a day after being found on Snowdon.
An investigation, which followed an incident in March 2007, decided that no officers should be charged.
A South Yorkshire Police spokesman told the BBC: "A mountain rescue team located him on Snowdon on Thursday afternoon and airlifted him to hospital, where he was placed under intensive care. He died at 1.30pm on Friday."
The county's Chief Constable Meredydd Hughes paid tribute to the officer, who had served with the force for 11 years.
Mr Hughes said: "This is terrible news and our condolences go out to his family."
A post-mortem examination to establish the cause of death has yet to be arranged.