WOODBRIDGE, Va. — A police officer who was fatally shot on her first day on the job was remembered Tuesday as someone who helped in soup kitchens, at suicide prevention programs and at mortuary services for Marines killed overseas.

Thousands of people came to the Hylton Memorial Chapel here to honor the officer, Ashley Guindon, 28. Officer Guindon died Saturday when she and two other Prince William County police officers were investigating a domestic disturbance at a home in Woodbridge, about 20 miles south of Washington.

As the officers approached the front door of the house, a gunman opened fire, hitting all three, the police said. Officer Guindon later died at a hospital; the other two officers were treated for their wounds. The suspect, Ronald W. Hamilton, 32, who the police said also fatally shot his wife before they arrived, was arrested on murder charges.

Officer Guindon was the 11th officer in the nation to die by gunfire in the line of duty since Jan. 1, a significant increase from the same period a year ago, when one shooting death was recorded, according to the National Law Enforcement Officers Memorial Fund. Another officer was killed Tuesday night in Euless, Tex., between Dallas and Fort Worth.