Ballard was shot and killed in the parking lot of a Wawa store in Bear, Delaware on Wednesday.
"He leaves behind his wife, Louise, a daughter, and a loving family and scores of loyal colleagues," said Gov. John Carney at a news conference on Thursday.
The suspect in the shooting was killed by police on Thursday morning after a nearly day-long standoff at his home in Middletown.
Ballard had been on the force for more than eight years, according to state police spokesman Sgt. Richard Bratz, and served in Troop 2.
He was a native of Bowie, Maryland, and went to Delaware State University. Ballard was a mentor to a number of college students interested in criminal justice. Grief counselors were sent to Delaware State for those students.
Ballard became a trooper in 2009, and was married in January, 2016.
He recently moved to Troop 2 from Sussex.
Here are just some of the many condolences offered by police since the shooting:
Our thoughts are with the Delaware State Police and the entire state of Delaware as they mourn the loss of their brave trooper. RIP, hero. pic.twitter.com/8Xv2oFLY70— Philadelphia Police (@PhillyPolice) April 26, 2017
Our thoughts and prayers go out to the @DEStatePolice after their tragic loss of a trooper in the line of duty today.— PA State Police (@PAStatePolice) April 27, 2017
Our thoughts and prayers are with our brothers and sisters of @DEStatePolice along with the family of the slain Trooper.— Haverford Police (@HaverfordPD) April 26, 2017
Our thoughts and prayers are with the family and friends of Corporal Stephen J. Ballard https://t.co/82Mxbg9elc— USPPNEWS (@usparkpolicepio) April 27, 2017
Our thoughts and prayers are with the family of Delaware State Police Corporal Stephen Ballard, who was shot and killed yesterday in Bear. pic.twitter.com/2BmVJ1EjXn— Delaware State House (@DEHouseMinority) April 27, 2017
The thoughts and prayers of the Transit Police are with the family & friends of Delaware State Police CPL Stephen Ballard.— Thomas J. Nestel III (@TNestel3) April 27, 2017
Our thoughts and prayers are with our brothers and sisters of the @DEStatePolice and the family of Cpl./1 Stephen J. Ballard.— WV State Police (@WVStatePolice) April 27, 2017
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