Dateline on NBC

When Susann Sills' mother, Theresa Neubauer, learned her daughter had taken a fatal fall, she wondered, “She fell? She never fell."

After two of John Smith's wives were found to have gone missing, Janice Hartman and Betty “Fran” Gladden Smith, family members took on a decades-long quest for justice. 

New breakthroughs in genetic genealogy, combined with investigative work, finally revealed who was behind the Toronto murders of Erin Gilmour and Susan Tice.

It initially seemed that Joy Hibbs died in a house fire, but an autopsy revealed she was killed before the home was set ablaze. Still, decades passed before an arrest came.

“Viewers will see jealousy at its worst, probably unwarranted, certainly corrosive, and in the end, deadly,” Dateline correspondent Keith Morrison said of new details in the shocking crime.

The mysterious murder of Michigan singer Egypt Covington would take years to solve, divide a community, and rip apart a family.

Heather Strube was fatally shot just feet from her toddler by "a murderer wearing a disguise," confusing witnesses and investigators before they focused on the shocking suspect.

The killing was a "murder based on obsession and delusion," Dateline correspondent Dennis Murphy said.       

Michelle Troconis, the girlfriend of Fotis Dulos, was found guilty of conspiracy to commit murder and other charges in the 2019 death of Connecticut mom Jennifer Dulos.

A false confession by Christopher Tapp landed the wrong man behind bars in Angie Dodge's murder, but more revelations were yet to come.