J.P is usually Justice of the Peace
The main Limerick newspapers are Limerick Leader and the Limerick Chronicle. The latter is not online but the Leader is on http://www.irishnewsarchive.com and the British News Archive has the Limerick Evening Post and Reporter.
The Limerick archives has an obituary database http://www.limerickcity.ie/Library/LocalStudies/ObituariesdeathnoticesetcfromTheLimerickChronicle/
