‘THEY HAUNT ME’: Killer doctor's son played key role in his demise as he recalls haunting sounds decades later.

‘LEFT ME BEWILDERED’: Fiancé of teacher found with 20 stab wounds suggests what led to her ‘suicide.’

Ellen Greenberg, left, in an undated family photo. (Greenberg family)

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SEVENTH SECRET: Suspected serial killer Rex Heuermann charged with another slaying.

HARD EVIDENCE: Suzanne Simpson's DNA found on murder suspect husband's saw that can cut metal.

Brad Simpson appeared in court to face murder charges in his wife's disappearance.

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LOST AND FOUND: Idaho prosecutors reject Bryan Kohberger's many attacks on search warrants.

‘MEANS SOMETHING’: JonBenet Ramsey's dad suggests daughter’s killer motivated by money in resurfaced interview.

BOULDER, CO - MAY 01: John and Patsy Ramsey, the parents of JonBenet Ramsey, meet with a small selected group of the local Colorado media after four months of silence in Boulder, Colorado on May 1, 1997. Patsy holds up a reward sign for information leading to the arrest of their daughter's murderer. Their 6-year-old daughter was found dead on Christmas night 1996. (Helen H. Richardson/ The Denver Post)

DELPHI MURDERS: Richard Allen sentenced for killing 2 teen girls on hiking trail.

‘WACK’ JOB: Suspected UnitedHealthcare assassin's plan revealed in journal entries: affidavit.

Luigi Mangione is led into an NYPD vehicle following his extradition hearing at Blair County Courthouse in Holladaysville, Pennsylvania, Thursday, December 19, 2024. Mangione is being charged with the murder of United Healthcare CEO, Brian Thompson. (David Dee Delgado for Fox News Digital)

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Ellen Greenberg, Gilgo Beach murders suspect Rex Heuermann, Delphi killer Richard Allen