A prisoner being held at the Pitigala Police station was found dead in his cell this morning.
The 42-year old man, a resident of Marakkoda, was taken into custody following a clash.
He is suspect to have committed suicide in his cell.
Meanwhile, Inspector General of Police (IGP) Pujith Jayasundara has ordered a probe into the death of the prisoner.
The IGP has promised stern action against those found guilty in any way of causing the death of the prisoner.