Hawaii Five-0 Season 9 Episode 19 : Pupuhi ka he'e o kai uli (The Octopus of the Deep Spews its Ink)

Five-0 investigate the murder of a window washer and find that the victim is actually a renowned street artist who may have a politically motivated bounty on his head. Also, Grover and Adam look into the murder of a gambler, and Junior helps his father when they are reminded of his sister's death.