Castle (2009)

S2E13 Sucker Punch

As they delve into the murder of an Irish mobster, Beckett and Castle stumble upon a local turf war linked to a notorious late-night infomercial star and a global drug trafficking ring. The investigation takes a painful turn when they discover that the suspect they are pursuing could be connected to the murder of Beckett's mother, making the case hit exceedingly close to home.