A 20-year-old man was charged with murder yesterday in the shooting death of his father at the home they shared in South Arlington.

Richard Robert Abreo was ordered held without bond in the slaying of Laurence Abreo Jr., 52.

Richard Abreo was initially charged Thursday night with malicious wounding after police, answering a call about 4:25 p.m., found his father, suffering from a gunshot wound to his chest, on the front porch of their home at 5603 S. 7th Rd.

Arlington police spokesman Tom Bell said the first officers to arrive saw the younger Abreo slam the front door of the semi-detached house from the inside. A few minutes later Richard Abreo surrendered after police telephoned the house and told him to come out with his hands up, Bell said. Police said a .45 caliber pistol was found in the house.

The father was taken to Northern Virginia Doctors' Hospital, where he was pronounced dead around 8:45 p.m.

Arlington Commonwealth's Attorney Henry Hudson asked yesterday for a psychiatric evaluation of Richard Abreo. Bell said Richard Abreo "had been acting strangely" for the past several days.

The younger Abreo, who is unemployed, spent Thursday at home with his mother toying with the .45 caliber pistol owned by his father, according to police.

The elder Abreo was returning home when he was shot at the front door, police said.