The scene at a house fire in Fairfax where Roy E. Rumsey, 58, and an unidentified female toddler were found dead. (Courtesy of Fairfax County police)

A man police suspect of killing a toddler and taking his own life inside his Fairfax County home that was set ablaze last week died of a gunshot wound to the head, according to a Virginia medical examiner.

The death of Roy E. Rumsey, 58, has been officially ruled a suicide, and investigators discovered a gun, numerous gas cans, a kerosene jug and flares inside the city of Fairfax-area residence, according to a search warrant returned Tuesday.

Authorities have yet to identify the young girl or her relationship, if any, to Rumsey, and said it could take some time to finish their investigation. The fire marshal has preliminarily concluded that the blaze at 12107 Fairfax Hunt Rd. began at two separate points, indicating arson, according to the search warrant.

The search warrant also states that investigators recovered a bullet from a fireplace in the home, carpet samples, a can of paint thinner and additional ammunition. Police have not detailed a motive for the incident but are investigating it as a murder-suicide.

A large fire erupted at the single-family home some time after 10:30 a.m. last Wednesday, a neighbor said. Fire crews responded about 11 a.m., finding flames shooting from both floors of the home.

After battling the blaze for 40 minutes, crews discovered the bodies of Rumsey and the toddler inside. Neighbors described Rumsey as a defense contractor who had little interaction with other residents of the neighborhood.