Steven was a boyfriend of Liza Snow, where he meet her at the University of California.
Very little is known about him, he was born in Los Angeles and at some point fell in love with Liza Snow. One day Steven and Liza broke up because of unknown reasons and was never seen again. It's mentioned by Liza that she helped him at one point when she was with Jason and she implied latter was possibly not fond of it.
It is unknown what became of Steven, during the events of Far Cry 3.