found this, thought it might be of interest.
.....ex-British Army Quartermaster Sergeant Harry Timothy Quinlisk, from Waterford , Ireland, made it his business to mix in Irish Republican circles ; Michael Collins refused his request to join the IRA as a training officer , and Quinlisk then contacted the British Under-Secretary , claimimg to have information on Collins and the IRA ; there was a £10,000 reward on offer from the British for information leading to the capture of Collins , and Quinlisk was determined to claim it ......
A meeting was duly arranged at Dublin Castle between the representatives of the British administration in Ireland and Quinlisk - however , the IRA had people working for them in the Castle and were notified immediately that Quinlisk had been in contact with the British Under-Secretary. An IRA investigation into the contacts uncovered a telegram and a copy of a despatch which confirmed that Quinlisk was an informer ; arrangements were made to deal with him .
In February , 1920, Quinlisk was 'inadvertently' made aware that Michael Collins was staying in Cork , and went there himself to confirm it ; on 18th February , 1920, IRA Volunteers from Ballyphehane in County Cork shot him dead .
regards mary.