(Manchester, NH) - A man charged with killing his parents and setting their house on fire in Manchester has been added to the U.S. Marshals Service's 15 Most Wanted List.

Investigators have sought 39-year-old Matthew Dion since March 2014, when the bodies of his parents, Robert and Constance Dion, were found at their Manchester home.

Investigators ruled the fire was arson. The couple's deaths were ruled homicides. Dion was charged with second-degree murder and arson in September.

Last fall, authorities believed he was in the Tampa Bay, Florida, area. They said he also has familiarity with the Atlanta area.

A reward of up to $25,000 is being offered for information leading to Dion's arrest.