His personal life in shambles following a break-up with his boyfriend, Brian Gene McNamara bellied up to the bar at Garden Grove’s Frat House, a popular watering hole for gay men. It was Monday, March 19, 1990. After several beers, McNamara, with sandy-blond hair and a reddish moustache that curled to his lower lip, flashed around a few hundred bucks his parents had given him to visit his brother in Garden Grove. McNamara, 31, had left his parents’ home near Palm Springs and checked into what was then the Bestin Inn Motel at 8062 Garden Grove Blvd. He last was seen leaving the…