The officer was responding to the suspicious vehicle report at around 2 p.m., when the shooting occurred, according to police. She was taken to MedStar Franklin Square Medical Center and died around 2:50 p.m., Vinson said.
The announcement comes one day after four schools in the Perry Hall area were placed on alert status while police searched for a potentially armed suspect.
Relatives of the officer, who would have been on the force four years by July, have been notified.
It is unknown at this time if the officer fired her weapon during the confrontation, Vinson said.
Officers were searching the area Monday night for suspects "who we believe are armed and risky", Police Chief Terrence Sheridan noted earlier.
"The community I represent stands united in grief for this fallen police officer, and our hope is that all those involved are brought to justice", Marks said.
A Maryland prosecutor says a teen arrested in the death of a Baltimore County police officer is being charged with murder and treated as an adult.
After the officer raised her gun at the people in the vehicle, the Jeep accelerated and "ran right over her, and raced out of the neighborhood", Tony Kurek told FOX45.More news: IPL 2018, RCB vs SRH
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The officer, who wasn't immediately identified, was bleeding badly from significant injuries and was pronounced dead after being rushed to a hospital.
Across the country, Sheridan said, the number of police officers killed in the line of duty has increased. "Baltimore County Public Schools appreciates everyone's cooperation as we ensure a safe and orderly dismissal". Shawn Vinson said Monday evening that heavily armed police - backed by trained dogs and aircraft - were conducting the wide manhunt in and around Perry Hall, Maryland, where the office was fatally injured Monday afternoon. He also said police discovered damage to a rear patio door of a home in the area, indicating the officer may have interrupted a burglary in progress.
One of the Kureks' other sons - a volunteer firefighter - ran outside and reportedly began CPR.
"Get out of the car!' at least three times, and then a pop", Amendt said.
According to WJZ, the suspect also told the detective that he "drove at the officer".
Kurek's neighbor, Dahle Amendt, said he had just settled into his recliner for a rest when he heard a woman's voice outside his house in the leafy neighborhood of single-family homes. It's a quiet community.
The Baltimore County police department told residents in the area of Belair and Klausmeier roads to shelter in place amid the search. Motorists should avoid Belair Road from Forge Road to Ebenezer Road.
Parents from three elementary schools - Perry Hall, Seven Oaks and Gunpowder - were placed on lockdown, with parents told they couldn't pick up their children after classes let out.