There are Ancestry trees of a Christopher Maher who died in Australia, but there is nothing to link him to the RIC man
1864 Dec 25. Born Dublin
1881 Census in Aldershot, a Private Black Watch
1920 Nov 25. Joined with RIC no 77229 & ADRIC no 210 Labourer & ex-Army
Posted Depot
1942 Died Rookwood, Cumberland , New South Wales, Australia