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Update - Denis Donaldson Murder Investigation - April 2006.

A second man (30s) arrested remains in Garda custody. The investigation is ongoing.

Gardaí are continuing to appeal to anyone with information in relation to this murder to contact them at the Incident Room at Letterkenny Garda Station on 074 9167100, the Garda Confidential Line at 1800 666111 or any Garda Station.