Someone You Thought You Knew
- Series
- Year: 2018
- Channel: Investigation Discovery
- Genre: documentary, crime
- Country: United Kingdom
- Seasons: 1
- Episodes: 2
This true-crime series tells stories of actual murders committed not by strangers but by someone the victim knew, someone hiding in plain sight, or someone leading a double life. These wolves in sheep's clothing use deception as a weapon to try to get away with murder.