By Matt Goodman & Sharrie Williams, CBS 11 News

DALLAS (CBSDFW.COM) – The Dallas Police Department has identified Officer Bryan Crenshaw, a three-year veteran of the force, as the driver of the squad car that killed a pedestrian who walked in front of his vehicle Sunday morning.

Beverly Kirk, 43, was struck while crossing the street in the 9900 block of Burton Road Sunday between an ambulance and a marked patrol car, which was following the emergency vehicle to a disturbance on Oak Branch Road, department spokesman Warren Mitchell said on Sunday.

While the ambulance had its emergency lights and siren engaged, the patrol car did not. Kirk was pronounced dead at the scene.

Mitchell said the type of call the officer was responding to does not require that the responder activate his or her emergency lights and sirens. The department has not determined how fast the officer was driving and will not speculate on speed until after an investigation is completed.

Crenshaw joined the Dallas Police Department in Dec. 2008 and works out of the Southeast Division, said DPD Chief of Staff Randy Blankenbaker. Crenshaw has been placed on administrative leave.

On Monday, the department said it was awaiting results from a toxicology test of Kirk’s blood.

On Sunday evening, Kirk’s family said she was leaving her daughter’s house before the accident.

While the department said in a release that “the officer did not have his lights and sirens activated because it is not required for this particular call assignment,” Kirk’s family questioned that decision.

Following a similar incident in 2008 when an officer responding to a late-night disturbance without his lights on struck and killed a 10-year-old boy, former Police Chief David Kunkle created a new policy that forbade officers from violating any traffic laws without their sirens and lights on.

It is not yet clear whether Crenshaw broke any traffic laws during the incident. The initial accident report listed Kirk as homeless and ruled that she “failed to yield the right of way” to the officer.

The posted speed limit where Kirk was struck and killed is 35 miles-per-hour.

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