On a warm July night, 19-year-old babysitter Sophie Carter posted a quick Instagram Story a blurry photo of the backyard with the caption: “weird car out front 😬.” Two hours later, she was dead.

In this episode of Text Me When You’re Dead, we examine how a fleeting social media post became the key to identifying her killer. Through digital forensics, geolocation tags, and eyewitness tips triggered by that post, detectives were able to reconstruct Sophie’s final hours and unmask a predator who thought no one was watching.

This story built from composite details based on real investigative techniques — shows how even disappearing messages leave permanent traces and how social media is transforming modern detective work.