Chance's past gets brought up on the episode "The Wife's Tale," as the team looks over the file for this case in this still image.
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In this scene from "The Wife's Tale," Christopher Chance does some research. Turns out, he killed the husband of his new client.
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Winston is all over a lead in this scene from Human Target. It's courtesy of the episode "The Wife's Tale."
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Human Target Season 2 Episode 2 Quotes

Internet dating, it's crazy huh?

Chance

Mrs.Brooks: You, you killed Daniel.
Chance: There's an assassin in this house, I can protect you.