American fantasy police procedural drama TV series

Joanne, Patty, Brian, and Craig prepare the old dorm building to be torn down. They are pursued by a serial killer with a wide range of murder methods, ranging from power drill to industrial steam cooker. Is it that spooky weird guy John Hemmit killing off the incidental characters, or is it someone/thing even more terrifying?

Amanda's deathbed request to her son, John, was for him to destroy all the lab notes etc. from her last experiment. She also blurts out he had a brother. At the funeral John meets Melissa, who claims to be his mother's biggest fan. Together with some of John's friends they go to Amanda's house, but none are prepared for what they find there.