( CNN ) -- It has been one month since University of Virginia student Hannah Graham was last seen , and her parents are asking for help . `` It is heartbreaking for us that the person or persons who know where Hannah is have not come forward with that information . It is within their power both to end this nightmare for all , '' Graham 's parents , John and Sue Graham , said Monday . Her friends have not given up hope either . In a statement released to CNN they ask `` that everyone in Charlottesville and surrounding areas be on the lookout for new clues . No clue is too small and every search of personal property , even if it does not yield a result , is helpful . '' For the better part of the last month , Mark Eggeman from the Virginia Department of Emergency Management has helped orchestrate the largest missing person search in Virginia 's history . `` The search for Hannah is currently in a transition stage , '' Eggeman said Friday . The city of Charlottesville is in charge as of Monday , taking over from the Department of Emergency Management , with a different focus and change in strategy . Eggeman said experts are still investigating tips and leads and are analyzing some imaging taken from a specialized camera mounted on board a private plane . The plane was donated to the search effort from Woolpert Inc . The design and geospatial company based out of Ohio donated its plane with an ultra-high precision sensor to scan `` areas of interest '' that were requested by law enforcement . The scanning is `` positionally accurate , '' Senior Vice President Shane Imwalle said , which can be a great help to law enforcement . While the search for Graham is paramount for the Charlottesville Police Department , solving the abduction and killing of Morgan Harrington , a Virginia Tech student who went missing in October 2009 , is a priority for the Virginia State Police . A law enforcement source tells CNN that foreign DNA in the Harrington case provides a forensic link to Jesse Matthew , who has been charged with abduction with the intent to defile in Graham 's disappearance . Local Yellow Cab owner Mark Brown said his cabbies who knew Matthew say he was driving a cab the night Harrington went missing . Matthew held a taxi cab license in the city of Charlottesville from 2005 to 2010 . A source close to the case confirmed that police recently impounded the cab Matthew was allegedly driving the night Harrington disappeared . The Virginia State Police said they `` will release new information at a time and in a manner that does not jeopardize the integrity of this ongoing , complex criminal investigation . '' Is Cassandra Morton 's death linked to latest case ? As the investigation into both cases continues , so does the search for Graham . In the early morning hours of September 13 , several surveillance cameras in the Charlottesville downtown mall area showed Graham leaving the Tempo Bar at around 2 a.m . The cameras also showed a man , later identified as Matthew , following her . Matthew is believed to be the last person who saw Graham alive . A warrant for his arrest was issued and authorities later found Matthew 1,300 miles away camping on a beach in Galveston , Texas . The 32-year-old Matthew was returned to Virginia and charged . His next court hearing is scheduled for December 4 . Matthew 's attorney did not respond to CNN 's request for comment . Graham 's friends continue to say how appreciative they are to everyone who has volunteered . `` We also want others to take the time to stop and hug someone they love . Words can not express our gratitude to the Charlottesville Police Department and the overwhelming support and love from our community ... please continue to keep Hannah , her parents , and her brother in your thoughts and prayers , '' their statement said . Authorities are offering a $ 100,000 reward for information leading to the safe return of Graham , 18 , who was a second-year student at the university . `` Again , we would like to urge anyone who has not already searched their property in the city of Charlottesville , or any of the neighboring counties , to please do so today . Please , please , please help us to bring Hannah home , '' John and Sue Graham said in Monday 's statement .
City of Charlottesville , Virginia , takes charge of search for Graham . - The University of Washington in Seattle is the first to announce that it will be holding a vigil on Saturday at noon local time ( 9am Eastern ) and then march from downtown Seattle to Lee Park A source says there is a DNA link to the case of another woman killed in 2009 .