TACOMA, Wash. (AP) _ A woman accused of shooting her husband and having her 19-year-old son help dispose of the body by locking it in a car and rolling the vehicle off an embankment was charged Wednesday with murder.

Angela Marie Ferguson, 39, was arrested Tuesday shortly after investigators searched her Puyallup home.

According to the charging papers, she had filed a missing-person report after the March 22 shooting and adamantly denied any role in her husband's death until she was confronted with evidence from the house, including blood and a shell casing.

Claude Walz, her son from a previous relationship, faces misdemeanor charges for allegedly helping dispose of the body, the prosecutor's office said.

Ferguson's 45-year-old husband, Randall Ferguson, was found dead Friday in the trunk of his 1990 Dodge Intrepid, which had been driven or pushed over an embankment south of Gig Harbor, about 8 miles northwest of Tacoma, authorities said. The Boeing Co. machinist had been shot twice in the head.

Angela Ferguson initially told the Tacoma News Tribune that her husband had stormed out of the house during a quarrel and that she filed the missing person report the next day when he didn't return.

``I just can't imagine living life without him,'' she told the newspaper. ``I have no idea what's going on.''

Angela Ferguson later told investigators that she and her husband had argued on March 22 and she had become so angry that she got a gun from the trunk of their car and threatened him with it, according to the charging papers.

She claimed the gun went off accidentally.

Angela Ferguson told investigators she did not recall firing a second shot, but that her son had urged her to put the man out of his misery, the charging papers say. Walz disputed that, saying he first became aware of the shooting when his mother woke him in a panic, insisting he help her move the body.

The Fergusons had been married nearly five years. Their 4-year-old daughter has been placed in the care of relatives.