A now-familiar name at the Chabonneau Commission has entered the scene at the hearings.

Garnier Construction boss Joe Borsellino took the stand late Monday afternoon.

He's been named time and again by previous witnesses as having taken a personal hand in an alleged system of collusion, where his company and a handful of others shared public infrastructure contracts in Montreal.

But Borsellino didn't give the impression that he gave a clear recollection of dates and events.

For instance, when he was asked whether he ever discussed a $40 million Rio Tinto plant renovation contract with former FTQ construction union boss Jocelyn Dupuis, he told commissioners he couldn't remember.

Commission lawyer Simon Tremblay then told Borsellino to think about things overnight, and then return on Tuesday.