: Initially despondent and feeling useless, Monk eventually discovers that his blindness removes the visual triggers of his OCD—such as filth and clutter—allowing him to investigate a burned-out crime scene without his usual distress.
While at a fire station to have his 30 smoke detectors tested, Monk witnesses the murder of a veteran firefighter named Rusty. During a struggle with the killer, Monk is splashed with a mixture of detergent and muriatic acid, causing severe optic nerve damage. Watch Monk S05E04 1
: Despite his lack of sight, Monk uses his other senses to notice a missing firefighting coat and other audio-sensory clues to identify the killer. Where to Watch : Initially despondent and feeling useless, Monk eventually