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DALLAS -- Police and swift water rescue teams are out in full force, searching for a retired assistant police chief.

Greg Holliday, 63, has been missing since Monday, when the Dallas Police Department issued a 'critical missing' alert. They believe Holliday is potentially depressed and perhaps confused after being hit by a car.

'The indications now are that he's suffering from some the type of health issue that's causing him to maybe not know where he is and be just very confused,' said Maj. Rob Sherwin.

Police had initially reported that Holliday may be armed, but sources told News 8 that his weapon was found in the house and authorities do not think he has a gun.

Holliday's wife reported him missing Monday night. She told police that he walked away from their gated North Dallas neighborhood about 2 p.m. and did not return. She told police because he was depressed because it was around the time of the anniversary of their daughter's death.

'He had stated to his wife that he was depressed about the anniversary of his daughter's death,' Sherwin said.

Police say Holliday was also taking anti-depressants and was apparently trying to ween himself off of them, which they fear may have exacerbated the problem.

Authorities believe Holliday received minor injuries when he was absentmindedly walked into the roadway and was hit by a car leaving a Chase bank at Midway and Frankford at 4:15 p.m. Monday.

'The driver stated he rolled up onto the hood of his vehicle, so it was obviously enough to cause injury to anybody,' Sherwin said.

Holliday refused to cooperate with Dallas Fire-Rescue personnel then walked away from the scene before Dallas police arrived.

Holliday retired as a Dallas police officer in 2002 after working there for 32 years. He ran for Dallas City Council in 2003 and oversaw the construction of the Jack Evans Police Headquarters.

News 8 has learned that Holliday also played a role in the 1990 firing of Police Chief Mack Vines. He was investigated for irregularities in the police department's handling of a fatal police shooting case.

Vines had fired an officer less than three weeks after the shooting. The officer alleged that the signatures on the investigation were forged, and the firing was overturned.

Holliday testified that Vines coached him on his testimony, which led to Vines being charged with counts of perjury. He was eventually acquitted.

Holliday is described as a white male, 6-foot-2, and 190 pounds. He has gray hair and brown eyes. He was wearing a yellow T-shirt and khaki shorts when he disappeared.

If you see him, you are asked to call 911.

E-mail teiserer@wfaa.com

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