DCI John Caldwell: The senior officer who led several high-profile murder probes

Constable Ronan Kerr’s murder was investigated by Detective Chief Inspector John Caldwell (PSNI/PA)

One of the high-profile investigations headed up by John Caldwell was the murder of PSNI officer Ronan Kerr in the same town where the senior detective was gunned down.

The killing of Constable Kerr was blamed on dissident republicans styling themselves as the New IRA – the same renegade group police suspect of shooting Detective Chief Inspector Caldwell on Wednesday night.