More mystery surrounds the death of a 19-year-old Wisconsin college student after prosecutors said that DNA from blood recovered from the home of a suspect in her death did not match the victim.

Maxwell Anderson, 33, of Milwaukee pleaded not guilty on Monday to several charges in connection with the killing and mutilation of Sade Carleena Robinson , who reportedly met Anderson at a Milwaukee restaurant for a first date on April 1, the night she disappeared, CBS affiliate WDJT-TV in Milwaukee reported.

According to an amended criminal complaint obtained by HuffPost, Robinson was reported missing by a friend on April 2, the day her severed leg was found at Warnimont Park in Cudahy, Wisconsin, just south of Milwaukee on Lake Michigan. Detectives also located the victims Honda Civic that day. The car had been damaged by fire, but officers said they were able to recover Robinsons belongings.