McGhee's former club, Motherwell, cashed in by selling David Clarkson and Paul Quinn in the summer and new manager Jim Gannon thought he could cover that by raiding some of his former rivals in that same division.
The home side started strongly and Steven McGarry had a 30-yard volley saved before O'Brien cut inside and played one-twos with Paul Quinn and David Clarkson before finding the net with a powerful low drive, which went in off Scott Severin.