FORT WASHINGTON, Md. -- Prince George's County police have identified the man who broke into a house on Piscataway Drive and shot and killed a woman as Jeffrey M. Gilbert, 23, of the 2200 block of Columbia Place in Landover, Md.

Earlier, police released new details about how the incident unfolded into a double homicide at the home of the pizza restaurateur in Fort Washington, Md.

Patricia Caniglia, 59, was shot at least once in the head with a .40-caliber handgun, News4 reported. Her son, Antonio Caniglia, was armed with a shotgun, which he fired, killing the gunman.

Police spokesman Lt. Terence Sheppard told News4, "The son was actually in the residence at the time. He called 911 to advise police as to what was going on. The suspect then came downstairs, where he was confronted by the son."

Antonio Caniglia was taken to a police station, where he was questioned by authorities. He voluntarily gave a statement in the presence of an attorney and was released after that statement, News4 reported.

So far, police have not revealed how Gilbert got into the Fort Washington address. Investigators said so far, no conclusive evidence has been found to prove that a break-in occurred. But, authorities do believe that Gilbert may have been dropped off in the neighborhood around the time of the incident. Witnesses said they saw a suspicious red or burgundy car in the area shortly before the incident, and that a woman driving the vehicle drove off shortly thereafter.

Police said cell phone records of everyone connected to the case are being examined to try to establish connections between people and places.

Investigators said Gilbert may have thought that money was in the home, and may have been attempting a robbery when he was shot.

Meanwhile, a wreath, flowers and words of condolence have been left at Mamma Mia's Pizza restaurant in Waldorf, Md., which Patricia Caniglia co-owned with her husband, Roscoe. He's said to be receiving a lot of support from the many fans and friends he's made over the 26 years the restaurant has been in Waldorf.