The IRA helped Gerry to fake his death and give him a new identity.
Henessey promised to speak the the high command on his behalf for a favour. It's highly plausible that they rescued Gerry from the water somewhere further up the coast, gave him new papers and helped him slip away. The kid on the bike is death.
He's always around when bodies show up.- He mentions John Wilkes Booth using a derringer to kill Abraham Lincoln. If he's Death, then he was there.
