YMMV / Law & Order: Special Victims Unit S10 E22 "Zebras"

• Shocking Moments: A paranoiac kills two people, and then tries to gas Elliot and Fin! And this is just the start; recurring character Dale Stuckey turns out to be the real antagonist of the story, as he fucked up the DNA and allowed the perp to walk free on a mistrial. Having gone into denial of his wrongdoing (and being a generally selfish narcissist), Stuckey sets out to redeem himself, his first step being to murder an innocent woman in the style of the perp to frame him as the culprit. His next step? Murder anyone who insulted him or hurt his feelings in the wake of his screw-up, leading him to target Judge Donnelly and outright kill O'Halloran, and capture and torture Elliot by slicing his chest with a knife. Olivia realizes something is up and manages to trick Stuckey long enough to help Elliot take him down.