Detective Santiago "Jimmy" Robertson

Jimmy Robertson is one of the Hollywood Division homicide detectives working the same crowded squad room as Harry Bosch. He's a company man in the best sense—competent, unflashy, and willing to do the grinding legwork of a case without needing credit. He treats the job as a craft, not a stage.

Paul Calderón plays him with a dry, low-key professionalism that grounds the show's procedural texture—he feels like an actual cop who's been doing this a long time, not a plot device. In a series built around one obsessive detective, Robertson's steadiness is its own quiet counterweight, a reminder that the work goes on around Bosch too.