Philadelphia Assaults Cold Case Killing

FILE - Philadelphia K-9 unit police walk into an area of Fairmount Park where the body of a woman, suspected to be that of fourth-year medical student Rebecca Park, was discovered, July 17, 2003, during an ongoing investigation of the scene the following day, July 18, in Philadelphia. Authorities say a man accused of slashing people with a large knife while riding a bicycle on a rail trail in Philadelphia is now a person of interest in the murder of Park that occurred among a series of high-profile sexual assaults two decades earlier. (AP Photo/Jacqueline Larma, File) FILE PHOTO

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