Characters
Homicide, sweet homicide.
— Det. Tim Bayliss · Homicide: Life on the Street

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker twists the familiar phrase about a sweet home by putting homicide in its place. Affection and grimness sit together, suggesting a dark familiarity, as though violent death were somewhere one settles into with a wry sort of comfort.
Context reviewed