Police released a sketch of the suspect.
He's described as 18 to 20 years old, 5'7" and 140 pounds, with gaps between his teeth.
Three women were mugged in February and March.
The robberies took place in the evening in the areas of Martin Luther King Jr. Boulevard to William Street and North Munn to Prospect Street.
In each instance, the suspect walked up to the victim and showed them his knife, demanded money and attempted to force the woman to a secluded area.
Fortunately, all of the woman escaped unharmed.
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