A Nashua man was arrested while in Dartmouth-Hitchcock Medical Center and charged with Negligent Homicide after a fatal car accident in Walpole on Sunday killed a passenger in his car. Police say Matthew Flynn 25 was impaired when he crossed over the center line on Rt. 12 land and struck Marguerite Lucus 64, of Springfield Vt. Lucas was taken to Springfield Hospital. Flynn was airlifted to DHMC and another passenger in his car Gerald Flynn 21, was air lifted to UMASS Medical Center in Worcester, Massachusetts. The deceased passenger’s identity is not being released pending positive identification by the New Hampshire Medical Examiner’s Office.