O'Connor made 109 league appearances, scoring 26 goals, with Shels from 1965/66 to 1971/72.
The record for the world's fastest hat-trick belongs to O'Connor, who scored three goals in 2 minutes and 13 seconds (some sources dispute this, and claim the actual time was 2 minutes and 14 seconds) versus Bohemians in Dalymount Park on 19 November 1967.