NEW : Authorities check other unsolved cases for possible ties . Jesse Matthew , a student at Morgan Harrington , went missing a farm months later . In addition , authorities said they are studying other unsolved homicide and missing person cases in Virginia : Police have Graham in custody as a suspect in Jesse Matthew 's disappearance . DNA links the same suspect to 2009 case of Morgan Harrington , source says .
NEW : Authorities check other unsolved cases for possible ties . Jesse Matthew , a student at Morgan Harrington , went missing a farm months later . Police have Graham in custody as a suspect in Jesse Matthew 's disappearance . DNA links the same suspect to 2009 case of Morgan Harrington , source says .