Police are investigating inconsistencies in a story about an attempted robbery before a woman was killed and man injured when they were struck by a pickup truck on Lake Shore Drive early Sunday in Gold Coast.

The 43-year-old man told investigators he was walking with Pamela Johnson, 32, about 1:40 a.m. in the 600 block of North Lake Shore Drive when they were approached by a group of males, at least one of whom was showing a handgun, according to Chicago Police and the Cook County medical examiner’s office.

He told police the two tried to run away across the drive when the group announced a robbery, but were hit by a pickup truck in the southbound lanes near Huron Street, police said. They were both taken to Northwestern Memorial Hospital.

Johnson, who lived in the 9100 block of South Marquette, was pronounced dead at 2:05 a.m., authorities said. An autopsy Sunday did not rule on her cause and manner of death, pending further studies.

The man’s condition was stabilized at Northwestern, police said.

Police said Sunday afternoon there were “discrepancies” in the robbery story and they were looking at surveillance footage from the area.

The southbound lanes of Lake Shore Drive were closed to traffic until about 3:30 a.m., police said. The police Major Accidents Investigation Unit and Area Central detectives are investigating.