Bobby Briggs, played by Dana Ashbrook, was the boyfriend of Laura Palmer, and therefore he was one of the lead suspects in her murder. His father is Major Garland Briggs, a member of the U.S. military, with whom he has an uneasy relationship. Bobby becomes jealous of James Hurley when he discovers that James was secretly seeing Laura. Laura on the other hand did not really love Bobby, and only used him as a source of cocaine.
The prequel film Twin Peaks: Fire Walk with Me shows that just two days before Laura Palmer's death, Bobby (accompanied by Laura) has a midnight meeting, arranged by Jacques Renault, with Cliff Howard, deputy in Deer Meadow, the town in which Teresa Banks was murdered the previous year. Howard is supplying Bobby with cocaine to be sold in Twin Peaks; when an inebriated Laura yanks the drugs out of his hands, Howard pulls a gun and is shot by Bobby. This scene serves to explain what James Hurley reported to Donna Hayward in the series' pilot—that Laura, the night she was murdered, had mentioned to him that someone had gotten killed.
Although Bobby seems to be a 'bad guy' concerning his illegal activities and dating with a married young woman he soon turns up to be very sensible (speaking up at Laura`s funeral), truly loving son (sharing a touching scene with his father Major Briggs when Garland told him about his wonderful dream that filled him with assurance of Bobby`s great future) and really serious young man - he became one of Benjamin Horne`s business assistants. Of course this can be seen as dubious, as he didn't respond warmly to his father's tale and because Benjamin Horne is a crook, while Bobby mistreats Shelly while over his head about his new role.