Virginia Gunman Facing Murder Charges, Pentagon Army Staff Sergeant

UPDATE
Police: Army staff sergeant killed rookie cop who was Marine reservist

Guindon was a former Marine Corps reservist and had a master's degree in forensic science, according to Hudson. Guindon served in the Marine Corps Reserves from May 2007 to February 2015 as a field radio operator, said Capt. Andrew Chrestman, a spokesman for U.S. Marine Corps Forces Reserve. She ultimately reached the rank of corporal and was awarded the National Defense Service Medal and the Selected Marine Corps Reserve Medal.

Virginia police officer killed on her first day on the job; man charged
CNN
By Ralph Ellis, Faith Karimi and Joe Sutton
Updated 4:02 PM ET, Sun February 28, 2016
Video Source: WJLA

Ronald Williams Hamilton faces two murder charges.

Hamilton is an active duty Army staff sergeant assigned to the Joint Staff Support Center at the Pentagon, said Cindy Your of the Defense Information Systems Agency at Fort Meade, Maryland.

Ashley Guindon was sworn in as an officer on Friday.

CNN)A police department in a Washington suburb is mourning an officer who was killed during her first day on the job.

Ashley Guindon, 28, of the Prince William County Police Department was fatally shot Saturday in Woodbridge, Virginia, while answering a domestic call in which two other officers were wounded and the suspect's wife was killed, county police Chief Steve Hudson said at a news conference on Sunday. Guindon had taken the oath of office on Friday.

Ashley Guindon was sworn in as an officer on Friday.

"The Prince William County Police Department is in deep mourning," Hudson said. "This is a sad day for everybody in this room, a sad day for law enforcement."

Ronald Williams Hamilton, 32, is accused of shooting the three police officers as they approached the front door of his house about 5:30 p.m. Saturday, Hudson said.
read more here