Knight was also an adjunct professor at Northern Virginia Community College.
"She was a great patriot who loved her country and loved serving the USA," family spokesman Theodore Hisey told WITN.
• Gerald L. Read, 58, of Alexandria, Virginia, was an information assurance specialist in the Navy Sea Systems Command who spent much of his career in military law enforcement and as a systems analyst, according to The Washington Post. The former Army lieutenant with two master's degrees worked as a civilian at the Navy Yard, managing security risks related to data.
His wife of 35 years, Cathy, described him as a "totally reliable, really, really solid" husband who loved reading -- especially books about the Civil War -- and was close to his daughter and three grandchildren, according to the newspaper.
Read and his wife had been rescuing Labrador retrievers for a decade. The couple had three Labs, an Irish setter and two cats, but Read was most fond of his black Lab, Roderick, the paper reported.
• Sylvia Frasier, 53, of Waldorf, Maryland, was the second-youngest of seven children, The Washington Post reported. Her family gathered Monday inside a three-bedroom home waiting for news.
"No matter how we feel, no matter what information we get from the FBI, we have got to forgive," Wendy Edmonds, Frasier's sister, told the newspaper. "We have to forgive. We can't become bitter."
The family released a statement remembering Frasier as a loving person with an infectious smile.
"If there are any words to describe her, it would be faithful, family oriented, and dedicated professional," the statement said.
Frasier was a deaconess, altar counselor and member of the arts and music ministry at Rhema Christian Center Church.
"She was a friend to everyone she met and a stranger to no one," her family said. "The only hurt she caused us was the void that was left when she was snatched up prematurely and gone too soon."
• Frank Kohler, 50, of Tall Timbers, Maryland, was married with two daughters, according to Baynet.com. Kohler was a past president of the Lexington Park Rotary Club, and was once "King Oyster" at the group's oyster festival, the local news outlet reported.
The family has faced tragedy in recent years, a neighbor told Baynet. Their home burned down in a gas explosion but they rebuilt, the neighbor said.
"I have many good memories as Frank and I worked together at Lockheed Martin," Bob Allen, a friend and fellow Rotary club member, said on his Facebook page, according to Baynet. "He took my job at Oyster Festival in charge of beer stands, a Steeler fan, a golfer, a great family man, a Christian, and a great friend. Frank you will be missed by me and so many!"
At least eight other people were injured, Washington Mayor Vincent Gray told reporters Monday night.
Three were shot, including a woman who was struck in the head but survived. The bullet did not penetrate her skull, and she was released from the hospital Tuesday night.
The others suffered contusions and chest pain.
Among the injured is Washington Metropolitan Police Officer Scott Williams, who underwent surgery Monday afternoon for gunshot wounds to the lower legs.
"He was most concerned about being able to talk to his mother and wanted to make sure he was able to speak to her before he went into surgery," said Dr. Janis Orlowski, chief medical officer at the MedStar Washington Hospital Center.