(CNN) -- The former governor of Oklahoma and his wife were robbed at gunpoint in the driveway of their northwest Oklahoma City home, officials said Thursday.
George Nigh, 82, and his wife, Donna, were unhurt in the incident about 10:15 p.m. (11:15 p.m. ET) Wednesday as they were returning home from a dinner engagement.
Nigh told reporters his wife was unlocking the front door of their home as he got flowers out of their vehicle when a man approached him from behind and said, "Get on the ground."
He said at first, he thought it was a neighbor joking with him. His wife, also thinking so, came back out of the house, he said.
But Nigh said when he turned around, "it was a man, and he had a gun ... he said, 'I want your billfold.' " The man also ordered his wife to the ground, he said.
"I did not get a good look at him, because my back was to him when he said, 'Get on the ground,' " the former governor said. He said he was not sure, in the darkness, whether the gun was real.
The man did not touch him, Nigh said, and after he handed over his wallet, the suspect ran away. He did not come into their home and did not take anything else, he added.
Asked if the suspect knew who he was, Nigh said, "I don't think so. He did not call me by name or title. I'm just presuming it was random. ... Maybe I just happened to be the one in the neighborhood who came home at that particular time."
Nigh added, "I was worried about my wife ... wanted to make sure we did what he said."
Officers and K-9 units responded after the incident in an effort to find the suspect but were unsuccessful, said Oklahoma City Police Sgt. Jennifer Wardlow. The investigation is ongoing, but police have no new information, she said.
Nigh was elected lieutenant governor in 1958, and in 1963 became the state's 17th governor, filling an unexpired term, according to the Oklahoma Department of Libraries website. After serving three more terms as lieutenant governor, he was elected governor in 1978 and 1982.
CNN's Divina Mims contributed to this report.