An Alberta RCMP officer has pleaded guilty to assaulting a prisoner in a detachment cell.

Cst. Desmond Sandboe admitted to beating a prisoner in a cell at the Lac La Biche detachment on Sept. 13, 2009.

In a statement, Supt. Joe Loran, acting commanding officer of K Division, said the incident is “appalling.”

Loran said Sandboe, a nine-year veteran of the RCMP, has violated the public’s trust and has done a great disservice to other RCMP members.

Sandboe will be sentenced on Jan. 27.