Gordon is found cornered in Casual Gals in the Royal Flush Plaza, being attacked by a small crowd of ravenous zombies. He scolds himself for leaving his wife LaShawndra Dawkins to the zombies in The Dark Bean.
Gordon is the first hostile survivor encountered in Sandbox Mode, and is found in the alleyway just outside the starting area. He is armed with a lead pipe, and drops $10,000 once killed.
If LaShawndra is killed, Gordon will immediately defect. Unless you kill LaShawndra far away or before talking to Gordon. (The same goes with LaShawndra. If Gordon dies, she will immediately defect.)
If you kill Lashawndra far away from Gordon, he will say "Have seen my water buffalo?"
If you give Gordon a crowbar he will say "a red crow bar that will certainly make someone feel like a free man" which is a reference to Gordon Freeman the protaganist of the Half-Life series of games and his iconic red crowbar. This was tested in DR2:OTR