Keating's tribute to his former bandmate was just visible as he appeared at Majorca's Palma Airport today, before accompanying the coffin home to Dublin.
As the visibly upset singer spoke, the numbers "76 09" were apparent beneath his T-shirt sleeve. They correspond to the years of Gately's birth and death.
Each of the band members - Shane Lynch, Keith Duffy and Mikey Graham - is understood to have had a memorial tattoo to their former colleague.
Lynch is already known for his heavily-tattooed physique
A source said: "The tattoos were done as a mark of respect for Stephen."
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