He is a pedophile who rapes a young girl named Malika Richardson and sprays insecticide in her mouth, putting her in an irreversible coma. Detectives Lennie Briscoe and Rey Curtis arrest another man, Owen Stokes, for the crime, but eventually discover Castillo's guilt and apprehend him. Jack McCoy gets him to accept a harsh plea bargain by tricking him into believing that his victim had regained consciousness and would testify against him.
He is played by Paul Calderon.
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