John Mark Byers, the adoptive father of victim Christopher Byers, gave a knife to cameraman Doug Cooper, who was working with documentary makers Joe Berlinger and Bruce Sinofsky while filming the first "" feature. The knife was a folding hunting knife manufactured by Kershaw. According to the statements given by Berlinger and Sinofsky, Cooper informed them of his receipt of the knife on December 19, 1993. After the documentary crew returned to New York, Berlinger and Sinofsky were reported to have discovered what appeared to be blood on the knife. HBO executives ordered them to return the knife to the West Memphis Police Department. The knife was not received at the West Memphis Police Department until January 8, 1994.