HAMMOND, Ind.—Officials here on Monday charged a convicted sex offender with murder in the death of a 19-year-old woman as police continued to investigate the deaths of six other women whose bodies the suspect allegedly helped authorities locate in abandoned buildings over the weekend.

Lake County prosecutors charged Darren Vann, 43 years old, in connection with the death of Afrika (aka Afrikka) Hardy and expect to file additional charges connected to the other deaths in the neighboring city of Gary, Ind.

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