Peter:
On the free site www.irishgenealogy.ie I located a possible baptismal record for David in Rathmore parish which is northeast of Killarney parish.
David Walsh November 20 1839 father Thomas Walsh mother Joanna Healy RC parish Rathmore lived in Meennagishagh townland
I did not find a marriage record but Rathmore marriage records start in January 1839.
I searched on the subscription site Roots Ireland to find a baptismal record for Bridget Maloney using the parents names provided but there was no record.
I did not find a marriage record for David and Bridget.
Roger McDonnell