Yes, I was up at the ice park when he fell, but no, there's no one to alibi me—I was off alone on the upper trail.
Remember, we don't have a reason to suspect this guy's alibi; at least not any reason from the planet earth.
It was a well-known fact that Mrs. O'Hara would never surrender her kitchen to a maid, so the alibi passed as genuine.
If an arrest were made, Wild had a plentiful supply of false evidence at hand to establish his agents' alibi, and he did not hesitate to obtain the conviction, by similar means, of such thieves as refused to recognize his authority.
I guess if they did, his hoodlum pals gave him an alibi.