The numbers in this case tell a grisly story, stretching from 1977 to 1993. Twelve women strangled to death, 11 sexually assaulted, nine found nude. Kansas City police say one man is responsible in the worst serial killing case in state history. Jackson County prosecutors have charged 53-year-old Lorenzo Gilyard of Kansas City with 12 counts of murder. Investigators continue to sift through other cases and more charges might be filed. Police arrested Gilyard this weekend, saying DNA evidence taken from a blood sample kept on ice for more than 15 years linked Gilyard with the murders. Eleven of the victims were prostitutes. One was mentally ill.