Was a serial killer at work in 51 unsolved Chicago murders?

Facing pressure from activists over the unsolved killings of 51 women since 2001, the Chicago Police Department has begun to review those cases to determine if a serial killer was at work.

A report by the Murder Accountability Project, a Virginia-based nonprofit group that analyzes information about homicides, said the killings of the 51 women - all of whom were strangled or asphyxiated - "have characteristics of serial murder."

Police Superintendent Eddie Johnson responded that there's no evidence to suggest a serial killer is responsible for any of the 51 slayings, but he said his detectives have launched a review.

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