Glen Rogers relied on his good looks and charisma to meet women, but it soon led to murder in a case profiled on Oxygen’s Unknown Serial Killers of America . How to Watch New season of Unknown Serial Killers of America premieres Aug. 2 at 10 p.m. on Oxygen. The charming drifter, profiled in Oxygen’s Unknown Serial Killers of America, was convicted of two murders and suspected of others. Who Was Killer Glen Rogers? Glen Rogers, who was featured in Oxygen's Unknown Serial Killers of America.