Castle
After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.

Season 7 · Episode 13 ·
I, Witness
Castle takes on a routine P.I. case, but the investigation turns deadly when he witnesses a murder.
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Episode 13 of season 7 of Castle: “I, Witness”. Aired 2015-02-02. Watch it online free on ZapFlix.