In ET’s exclusive sneak peek at the next-to-last episode of ‘Boston Blue’s debut season, Danny Reagan (Donnie Wahlberg) and Lena Silver (Sonequa Martin-Green) come to the chilling realization — with the help of Sarah Silver (Maggie Lawson) — that there’s a killer ‘hunting cops.’ See how this unfolds on ‘Boston Blue,’ airing Fridays at 10 p.m. ET/PT on CBS and streaming on Paramount+.
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