Alexandria Mayor Bill Euille urged residents to be patient while authorities investigate the fatal shooting of a 22-year-old man by an off-duty Arlington County deputy sheriff.

"I am confident that appropriate justice will prevail once all facts are known," Euille said in a statement Thursday. "Our Police Department is investigating this case and they are working with the Office of the Commonwealth's Attorney using the standard procedure used for such cases in Alexandria."

Early Wednesday morning, Julian Dawkins, a driver for the "PBS NewsHour" program, was shot and killed at the intersection of Lynhaven Drive and Evans Lane following a confrontation with Deputy Sheriff Craig Patterson, Alexandria police said. The medical examiner's office has ruled Dawkins' death a homicide.

Patterson has been questioned about the incident but has not been charged Thursday. Police said that they are still interviewing witnesses to determine what happened leading up to the shooting. They said that the "investigation will be thorough and will take time to complete," and that the Commonwealth's Attorney's Office will determine whether charges will be filed after the investigation is finished.

Patterson, a 17-year veteran of the sheriff's office, was placed on administrative leave after the shooting. Police said that Patterson's employment in law enforcement does not affect the investigation.