Alzheimer's victim William A. Gulley has wandered away from home before, unaware of where or who he is.
But this time, he may have taken a .22-caliber revolver with him, police say.
Gulley, 83, of 10314 N Nebraska Ave., left his home at 11:30 p.m. Saturday and hasn't been seen since, said Tampa police spokesman Steve Cole.
"We don't think that he is necessarily dangerous," Cole said. "But we are asking that people don't approach him and that they call us instead."
Cole said anyone who sees Gulley should call 911.
Police say they don't know why he may have a gun. When Gulley's daughter reported the man missing Saturday, she said he might have a gun. Cole said he was unable to get a copy of the police report late Monday for further details.
Gulley's daughter couldn't be reached for comment.
"He may take someone trying to help him the wrong way," Cole said. "Anyone with a gun in that condition could be dangerous to himself or others."
Gulley is described as being 5 feet 8 inches tall and 135 pounds. He has gray hair and gray eyes and should be wearing wire-rimmed glasses. He was last seen wearing blue jeans, a turquoise shirt and black shoes. He also has a hearing aid in his right ear.
Police officials think Gulley may be trying to get to his former home at 11003 Hanaway Drive in Riverview. Police are checking the area.
"He may have stopped at a hotel or at a friend's house and just not know we are looking for him," Cole said.