Reptile Ending Explained: Who The Killer Is

Grant Singer’s thriller Reptile weaves a web of deception as Benicio del Toro’s Detective Nichols tracks down the killer of a young real estate agent named Summer (Matilda Lutz), and in the process uncovers department-wide corruption within the ranks of the Scarborough police force. After going through several suspects, including Summer’s lover and fellow real estate agent Will Grady (Justin Timberlake), ex-husband Sam (Karl Glusman), and disgruntled neighbor Eli Phillips (Michael Pitt), he finally discovers the identity of the killer and the reason why they killed Summer. Unfortunately, his revelations put him in the crosshairs of powerful players in a convoluted game of cat-and-mouse.