PRAGUE (AP) — A Czech prosecutor says an American man suspected of killing four Czech family members has been formally charged with murder.

Prosecutor Hynek Olma says the prosecutors believe the suspect, Kevin Dahlgren, fatally stabbed his aunt, uncle and two cousins in the Czech city of Brno during a May 2013 visit. Authorities say that the victims were stabbed in the head and neck and Dahlgren apparently tried to burn three of the bodies.

Dahlgren, of Palo Alto, California, was detained at Washington Dulles International Airport as he returned from the visit. He was extradited to the Czech Republic last year.

A date for his trial at the regional court in Brno hasn't been set yet. If convicted of committing four murders, Dahlgren could face a maximum sentence of life in prison.