Warning: Spoilers for the end of Based On A True Story season 1!An intriguing theory says Matt may not be the real killer in Peacock's Based on a True Story. In Peacock's comedy thriller, a couple named Nathan and Ava Bartlett embarks on a plan to create a hit podcast to interview the serial killer known as the West Side Ripper about his crimes. Their podcast is created with mysterious plumber Matt Pierce, the suspected killer. However, as the plot thickens, doubts begin to surface, casting shadows of suspicion over the true identity of the notorious killer. A compelling theory suggests that the West Side Ripper might not be Matt Pierce but rather a more unexpected Based on a True Story character.