Soldier accused of killing police officer on her first shift Prince William County Police Chief Stephan Hudson, left, speaks during a news conference next to a picture of Ashley Guindon at Western District Station, in Manassas, Va., Sunday, Feb. 28, 2016, about a fatal shooting Saturday evening. Ronald Williams Hamilton is being held without bond in the Prince William County Adult Detention Center on charges that include murder of a law enforcement officer, Guindon.

2/8 SLIDES © AP Photo/Jose Luis Magana

Prince William County Police Chief Stephan Hudson, left, accompanied by Prince William County Commonwealth Attorney Paul Ebert speaks during a news conference at the Western District Station, in Manassas, Va., Sunday, Feb. 28, 2016. Ronald Williams Hamilton is being held without bond in the Prince William County Adult Detention Center on charges that include murder of a law enforcement officer Saturday evening.

3/8 SLIDES © Prince William County Police Department via AP

A photo provided by the Prince William County Police Department shows, from the left, Officer Steven Kendall, Officer and Ashley Guindon with Lt. Col. Barry Bernard, deputy chief of the Prince William County, Va., Police Department. Officer Ashley Guindon was shot and killed Saturday, Feb. 28, 2016, and two of her colleagues were wounded in a confrontation stemming from a call about an argument. Guindon and Kendall were sworn in on Friday, and Guindon was working her first shift with the Prince William County Police Department when she was killed.

4/8 SLIDES © AP Photo/Jose Luis Magana

Police surround
a home Sunday, Feb. 28, 2016, following a fatal shooting at the residence Saturday evening, in Woodbridge, Va. Ronald Williams Hamilton is being held without bond in the Prince William County Adult Detention Center on charges that include murder of a law enforcement officer.

5/8 SLIDES © Provided by Associated Press

Ronald Williams Hamilton is being held without bond in the Prince William County Adult Detention Center on charges that include murder of a law enforcement officer, Guindon. (Prince William County Police via AP)

6/8 SLIDES © AP Photo/Jose Luis Magana

Prince William County Police officer Mike Lomanaco walks by a home Sunday, Feb. 28, 2016, following a fatal shooting at the residence Saturday evening in Woodbridge, Va. Ronald Williams Hamilton is being held without bond in the Prince William County Adult Detention Center on charges that include murder of a law enforcement officer.

7/8 SLIDES © AP Photo/Matthew Barakat

Police remain on the scene late Saturday, Feb. 27, 2016, on Lashmere Court in Dale City, Va., where three Prince William County police officers were shot responding to a domestic violence call. Police said Officer Ashley Guindon died in the shooting.

8/8 SLIDES © AP Photo/Matthew Barakat

More than 100 patrol cars line the roads outside Inova Fairfax Hospital early Sunday morning, Feb. 29, 2016, to stand vigil and provide escort to the medical examiner for the body of slain Prince William County police officer Ashley Guindon, who was shot and killed Saturday responding to a domestic violence call. Two other officers were also shot and taken to the hospital. Guindon had been sworn in as an officer on Friday.

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WOODBRIDGE, Va. — An Army sergeant killed his wife following a day-long domestic dispute and then fatally shot a responding police officer working her first shift on the job, police said Sunday.
Sgt. Ronald Hamilton, 32, faced two counts of murder, two counts of assault and weapons offenses after the shooting spree Saturday that also left two other officers wounded.
Officer Ashley Guindon, 28, had joined the force in ceremonies Friday, Prince William County Police Chief Steve Hudson said. He said the officers were responding to a 911 call from Hamilton's wife, Crystal, when they approached the front door.
"The subject opened fire," Hudson said. He said all three sustained critical wounds and that Hamilton surrendered to additional officers that responded.
The second wave of officers also provided emergency treatment to the wounded officers until emergency medical responders arrived. Guindon died later Saturday, Hudson said. The wounded officers are Guindon's field training officer, David McKeown, 33, and Jesse Hempen, 31. They received non-life-threatening injuries, Hudson said.
"Our thoughts and prayers go out to the family and loved ones after this sad and senseless death," Hudson said.
© AP Photo/Jose Luis Magana Prince William County Police Chief Stephan Hudson, left, speaks during a news conference next to a picture of Ashley Guindon at Western District Station, in Manassas, Va., Sunday, Feb. 28, 2016, about a fatal…
The body of Crystal Hamilton, 29, was found inside the home, along with the couple's uninjured 11-year-old son. The boy was being cared for by relatives, Hudson said.
Guindon had briefly been a county police officer a short time ago but left for personal reasons during training, Hudson said. She reapplied and was rehired.
"She clearly had a passion to serve others," Hudson said.
Guindon had a master's degree in forensic science and once served as an intern for the police department, Hudson said. She held a degree in forensic science.
Neighbors say they heard gunshots, and one person said they heard an officer yell "come out with your hands up." A woman who said she was visiting a neighbor in the area of the shooting told The Washington Post she heard loud sounds but couldn't believe it was a shooting.
“We never thought it could be shots,” Maritza Gutierrez told the Post, adding that she heard "boom, boom, boom, something like that ... very quick."
The police department announced the arrival of two new officers to the force in a tweet Friday: "Welcome Officers Steven Kendall & Ashley Guindon who were sworn in today & begin their shifts this weekend. Be safe!"
Contributing: WUSA-TV in Washington, D.C.