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Dateline: Unforgettable
Season 2 · Episode 18
A Promise to Helene
0.01h 24mNovember 8, 2022
A college student is found murdered and the case sits cold for nearly 40 years. Josh Mankiewicz reflects on the vow that keeps the case alive and the innovative method used to catch the killer.
Episodes
- Episode 1Under The Desert Sky
- Episode 2The Officer's Wife
- Episode 3The Eastlake Conspiracy
- Episode 4A Novel Defense
- Episode 5Smoke And Mirrors
- Episode 6Somebody's Daughter
- Episode 7The Last Dance
- Episode 8Return to the Lonely Road
- Episode 9The Man Who Talked to Dogs
- Episode 10Out of the Darkness
- Episode 11Justice for Nikki
- Episode 12House of Secrets
- Episode 13The Black Widow of Lomita
- Episode 14The Pink Gun Mystery
- Episode 15Even the Devil Went to Church
- Episode 16The Day Jennifer Disappeared
- Episode 17In the Dead of Night
- Episode 18A Promise to Helene
- Episode 19Death of a Golden Girl
- Episode 20Secrets From the Grave
- Episode 21Fallen
- Episode 22The Box
- Episode 23The Creek
- Episode 24Mystery on Blood Mountain
- Episode 25The Betrayal of Sarah Stern
- Episode 26The Dead of Night
- Episode 27Deadly Valentine
- Episode 28Down the Back Staircase
- Episode 29The Ranch
- Episode 30What Happened to Amy?
- Episode 31The Secret of Spirit Lake
- Episode 32The Plan
- Episode 33The Haunting
- Episode 34Internal Affairs
- Episode 35Return to Manitowoc County
- Episode 36Twisted
- Episode 37Good & Evil
- Episode 38The House
- Episode 39Breakout
- Episode 40Family Affair
- Episode 41The Women and Dirty John
- Episode 42Open Water
- Episode 43The Silhouette
- Episode 44The Sting
- Episode 45Deadly Desire
- Episode 46Plot Twist
- Episode 47The Life and Death of Princess Diana
- Episode 48The Last Dive