Yes, he was seen following Dick McKee and Peadar Clancy from Phil Shanahan's pub the night before they were tortured to death in Dublin Castle; he was known to frequent the police - well, he was a former soldier and on the edge of police from what people said.
So naturally the Squad, who had fought by Dick McKee from Jacob's in 1916 and before, and loved both him and Clancy, were going to track him down and wipe him out.
He's a mysterious figure - I wonder if he spent time in India, think I might've read that.