Arkansas cops are hunting for a serial killer responsible for at least four knife attacks and three killings in Little Rock Police in Little Rock, Arkansas, are looking for a serial killer tied to four knife attacks that occurred between August 2020 and April 2021 Larry McChristian, 64, Jeff Welch, 62, and Marlon Franklin, 40, were stabbed to death months apart in Little Rock's Midtown Debra Walker, 43, was stabbed 15 times on April 11 but survived She described her attack as a black man standing at over 6 feet tall A $20,000 reward is being offered for information leading to an arrest