Say Uncle

The CSI team investigates a shooting at a Koreatown neighborhood party, in which the mother and uncle of a small boy, Park Bang, are murdered. Grissom stakes a personal investment in the case when it is discovered that Park Bang witnessed the shooting and he goes missing. Grissom suspects the killer tracked Park down and is trying to keep him from talking, the case becomes more complicated when it's revealed Park has HIV and his mother put him on an unauthorized medical trial.