NCIS: Los Angeles Season 1 Episode 6

Marine lance corporal Brandon Valdivia (25), in Camp Pendleton's supply unit, falls to his death from the Apex hotel roof during one of several pool parties he threw there with USMC mate Alex Walder. He has no suicide motive and a bruise indicating he was pushed. He bought computer games and resold them at half price. Secret Service Agent Natalie Giordano is brought in when NCIS finds his motif: laundering excellent counterfeit $100 cash. Callen goes undercover to trick the accomplices, who are also murder(ous) suspects.