SPOILER ALERT
August 9th, 2010
At the outbreak of the apocalypse, Chase takes refuge on the rooftop of a building with his partner Harris.
The two decide to scout the surroundings, but as soon as they step into the courtyard they are overtaken by walkers, and Harris is devoured. Chase finds shelter inside a warehouse where he encounters BJ, a former employee who has taken control of the place.
Inside one of the storage units, Chase discovers boxes containing family photos of Rick. In exchange for helping repair a generator, Chase is promised a van, but BJ proves untrustworthy: he shoots Chase and throws him outside onto a pile of corpses. Only slightly wounded, Chase reenters the warehouse seeking revenge and discovers, in a locked room, Kelly, a woman gagged and tied to a bed, clearly imprisoned by BJ and forced into sexual slavery.
Chase frees Kelly, and together they get rid of BJ by decapitating him. They then escape in a van as the warehouse is overrun by walkers.
P.S.: The dates in the timeline are approximate, but everything happened more or less around those days.