State police are seeking charges against the driver of a Jeep involved in a fatal Fourth of July car accident.

Cape and Islands district attorney Laura Marshard said state police issued a complaint for two charges of motor vehicle homicide against Thomas C. Jones of Dummer, N.H., after a two-car crash on Barnes road between the Jeep Wrangler he was driving and a Volkswagen Tiguan driven by a 19-year-old New Hampshire man.

Mr. Jones’s son, Seth Jones, 26, and Seth Jones’ girlfriend, Heather Laflamme, 21, both died in Boston hospitals after sustaining injuries in the crash.

Ms. Marshard said there will be a clerk’s hearing on August 16 to determine if there is probable cause for the charges, which are misdemeanors. The driver of the Volkswagen, Benjamin T. Johnson, was issued a citation for a moving violation, she said.