Serial killer gets death penalty for 11 murders

Ruan Chuansheng, a law professor with the Shanghai Administration Institute, said the cracking of the case was due to the unrelenting efforts of the police and the development of investigative methods.

"The developments of criminal investigative techniques, such as the biological evidence and DNA, were the key to finding the culprit," he said, adding that such a verdict can also improve the public's sense of security.