Donal is 5’7”, of slim build, and wears glasses.
The 55-year-old was wearing a grey fleece top and dark coloured tracksuit bottoms when he was last seen.
Police Derry City and Strabane say: “Donal is believed to have travelled into County Donegal on the morning of 10th May.
“Our colleagues in An Garda Siochana are aware and are assisting with our efforts to locate Donal.
“If you believe you have seen Donal since the morning of 10th May please call us on 101 quoting reference number 722 of 10/05/2022.”Tags: