Las Vegas police have revealed a new layer in the death of Tammy Meyers, who died Saturday after being shot inside her car in front of her house following a driving lesson with her teenage daughter. Meyers' family initially told police that the driver of another vehicle followed them home after avoiding an accident, but police now say that isn't the whole story: At one point last Thursday night, Meyers and her armed son went looking for the driver and the car.

Meyers' family first claimed the mother, while driving her daughter back from a driving lesson in the parking lot of a middle school, almost got into a crash with another vehicle. One of the three alleged passengers of that vehicle, the family told police, got into an argument with Meyers after pulling over, and threatened her. That car then reportedly followed Meyers' home, where someone in the car opened fire, hitting Meyers, who died in the hospital Saturday after being taken off life support.

Las Vegas Metro Homicide Lt. Ray Steiber etched out a new timeline of events that led to Meyers being shot at a press conference Tuesday night. From the Las Vegas Review-Journal:

On the way home, with the mother driving, a speeding vehicle approached them from behind, Steiber said. That vehicle then passed Meyers' car, and her daughter reached over from the passenger seat to honk the horn.

Then the other car stopped in front of Meyers' car, Steiber said. The driver stepped out and threatened her, so she sped away.

Meyers went home, dropped off her daughter, and woke up her 22-year-old son, Steiber said. The mother and son left minutes later in search of the other car.

Her son was carrying a gun that was registered to him, Steiber said.

Like in the family's initial story, the second car followed Meyers' home, and after the mother and her son exited their vehicle, were fired upon. Meyers' son returned fire. Cops have not said how exactly Meyers and her son were able to find the car.

"I did what I had to do to protect my family. Everyone can think what they have to think; I did it for a reason. And I'd do it for anyone I love," Meyers' son Brandon told NBC News at a vigil for his mother Tuesday night. "My mother was a very strong woman...She was a kind woman. She didn't deserve this."

Meyers' husband, Robert, was more circumspect, telling the Las Vegas Review-Journal at the vigil, "When people are panicked, things happen. Sometimes emotions get ahead of what you should do."

[Image via KLAS]