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‘Sex-slay’ shocker is thrilling finale for hit series ‘Torn from the Headines’

She was a promising young crime-lab worker, but on April 27, 2009, the microscope turned —  when she was found bound, naked and mutilated in her Queens bed, victim to very kind of murder that she herself once helped solve.

The shocking killing of NYPD forensic investigator Michelle Lee is the sixth and final episode in Investigation Discovery’s smash hit, true-crime series, “Torn from the Headlines: New York Post Reports.”

The five episodes to air so far have been so addicting, the series is now the number one reason new viewers are signing up to Investigation Discovery’s popular app, IDGO, a Discovery rep told The Post.

Airing Monday at 10 p.m. ET, episode six, “CSI Slay,” follows the NYPD and New York Post investigation into the 24-year-old Lee’s grisly end.

Someone wanted Lee more than dead.

The pretty brunette was found with her wrists bound to her bedboard by a cell phone charger cord.

She had been stabbed in her neck with a long, butcher knife that her killer had left in place. And she had been beaten about her head and seared on her chest with her own steam iron.

“Sex-Slay Shocker,” the first New York Post headline on the murder would say.

But was it a sex slay, or staged to look like one? Lee’s stunned colleagues from the NYPD crime-scene unit would be left to piece together what happened.

“Torn from the Headlines” is a partnership between the New York Post and Investigation Discovery that invites the viewer along for the often twisty, always suspenseful ride — as police and reporters probe some of the city’s most sensational crimes.

The series features never-before-seen evidence, archival news footage and powerful interviews with survivors, family members, cops and reporters.