WHITAKER, WILLIAM .jpg

William Whitaker

(Cuyahoga County Sheriff's department)

CLEVELAND, Ohio -- A man who prosecutors say sometimes approached his victims on bicycle is charged with raping four women since 2005.

The sexual assault cases were linked to William Whitaker based on DNA found in rape kits.

Whitaker, who was charged last week, pleaded not guilty to the rape and kidnapping charges.

He is among more than 240 men the Cuyahoga County Sexual Assault Kit Task Force has identified as serial rapists.

An attorney appointed to represent Whitaker asked that he be evaluated by the court's psychiatric clinic. The attorney could not be immediately reached for comment.

The 35-year-old was previously named as a suspect in several of the cases but was not charged after police couldn't locate victims or said they declined to prosecute.

Whitaker has a criminal history that includes a number of drug crimes.

He is accused in the following cases: