Pennsylvania authorities conducted a nine-year investigation before arresting a man in the murder of his wife.

The investigation began after Olga Sanchez, 30, burned to death in a house fire in Lancaster in 2010, police said. The fire was ruled arson after investigators determined it was started with gasoline.

On Thursday, Carlos Montalvo-Rivera, 52, was charged with arson and murder in the death of his wife, police said. He was also charged with trying to kill their young children, ages 13, 9 and 8, each of whom survived the fire.

Montalvo-Rivera was being held without bail.