That's what ended the life of Tammy Meyers -- the latest face of road rage in America.  But there are still a lot of unanswered questions in the case, including exactly what led to the confrontation, who pulled the trigger that killed her and where the other driver is now.  She's a 44-year-old mother of four and grandmother of one, described by her husband as "a beautiful woman" who loved him, "her kids and ... a lot of other people."  "She never did anything bad to anybody," her husband Robert Meyers said.  Nor did she put up with nonsense, he added, explaining that "if she was in the Marines, she would have been a master sergeant."  And, Robert Meyers added, "She hated bullies."  Giving her 15-year-old daughter a driving lesson.  The two went to the parking lot of a nearby school, where the teen got behind the wheel. Then they switched places, with Meyers driving back home.  Yes. And Lt. Ray Steiber, a Las Vegas homicide detective who is heading the investigation into Meyers' death, suggested this isn't unusual.  He notes that Nevada requires first-time drivers "to log nighttime driver hours" to get their license.  "When I taught my children how to drive, there were certain aspects of driving that they needed to learn," Steiber said. "And one of them was driving at night."  Nothing much out of the ordinary at the actual lesson. It's what happened after it that's key.  As the mother drove her daughter home, she was "still giving her daughter a lesson (on) how to merge into lanes, how to properly make turns on a public roadway, (when she spotted) a vehicle speeding up rapidly behind her," Steiber said.  That vehicle, a four-door sedan, pulled up behind her and then to the side of her.  It was then that Meyers' 15-year-old daughter "actually reached over while her mom was driving and honked the horn," the detective said.  "She was getting a driving lesson, so she figured that this person was speeding and ... needed to be corrected," added Steiber. "Right or wrong, she beeped the horn."  That got the other driver's attention: He pulled in front of the Meyers' car, stopped, then walked back toward the mother and daughter.  He said something to them -- exactly what hasn't been stated publicly -- but Meyers and her daughter aren't believed to have responded, according to the detective.  She went back home, telling her teenage daughter to go into the house, wake up her brother Brandon and ask him to get in car. Brandon Meyers, 22, brought a registered gun with him.  "Mrs. Meyers (was) scared, but she's upset," Steiber said of the woman's feelings at the time.  Tammy Meyers then drove back out of her neighborhood to the scene of the confrontation to see if she could find the man she'd clashed with, the detective said.  That's a judgment call and may depend, in part, on what transpired earlier.  Steiber said only that police don't think Meyers did anything wrong criminally.  Her husband Robert, who was out of state at the time, said, "My wife paid the ultimate price for it because of the mistakes she made."  Yes and no. According to the Las Vegas homicide detective, "at one point Mrs. Meyers was following what we consider a suspect vehicle. And then, at another point, they broke apart and Mrs. Meyers went home."  Steiber said that the second encounter happened at least 5 minutes after Meyers went home the first time and everything unfolded "within a couple blocks" of each other.  Did the other car's driver ever totally lose track of Meyers and her vehicle? What was his mental state at the time?  That, like much else with this story, is still unknown.  She and her son get out of her car. Then, a gray or silver sedan pulls into her cul-de-sac and someone inside it begins firing.  Meyers' son, Brandon, shoots back, Steiber said. But that doesn't stop the shooter, who backs out and drives away.  When he does, Brandon Meyers discovered that "his mother, who was standing off to the side and behind him, had been struck by gunfire," according to the detective.  It's right after that, at 11:22 p.m., that relatives and neighbors first alert police about what's transpired.  Not good. One bullet struck her in the head, and she was rushed to UMC Trauma Center.  Meyers was taken off life support two days later, on Valentine's Day.  No one is denying that Brandon Meyers used his gun. Still, Steiber said that police believe a bullet from the sedan driver's gun -- not that of her son -- killed Tammy Meyers.  Should Brandon have opened fire? His father, Robert, said at a vigil Tuesday "there were mistakes ... But this particular mistake was made to keep a bigger mistake from happening."  "My son is not an animal," Robert Meyers said. "My son is a hero in my book."  The 22-year-old says he was just trying to protect his family.  "Everyone can think what they have to think," Brandon Meyers said. "I did it for a reason, and I'd do it for anyone I loved."  Road rage: Cameras and guns only add to the problem  They're hurting. A week after the shooting, Tammy Meyers still hadn't been buried. But loved ones did hold a candlelight vigil, one that Robert Meyers said was meant "to show my respects to my wife and to let her kids get some of this grief off (their chests) and heal."  "It's going to take a lot more than this to do it," he added.  Yes. Robert Meyers alluded to such criticism -- specifically related to the difference between the family's initial accounts and the timeline later related by police -- in a Facebook post.  "I was told one version of what happened to my wife ... and I never said anything different than (what I was) told," he wrote late Wednesday night. "If all of you people ... think I was a fraud and lied about facts, I'm truly sorry."  In the same Facebook post, Meyers said all money raised for the family via GoFundMe -- an account that Meyers said a friend started -- will be returned. The related GoFundMe page has been shut down.  Authorities haven't given his name, but they have described him as being white, about 25 years old, standing 6-feet tall and weighing about 180 pounds. He has dirty blond hair -- which was spiked up at the time of the shooting -- and blue or hazel eyes, according to police.  As to his vehicle, authorities haven't given a make, model or license plate. Las Vegas police characterized it simply as a "four-door gray or silver sedan (that) may possibly have damage to the front driver's side of the vehicle" as well as possible bullet holes from the February 12 shootout.  A week after the shooting, this vehicle's driver remains at large -- with police giving no indication that they know where he is or exactly who he is.  Apparently not, according to Steiber.  Calling it an "open and ongoing investigation," Steiber said authorities are still piecing together exactly what happened and trying to answer the all-important question of exactly who was responsible.  "Right now, there (are) different things that we're looking at (including) video," he said. "... What we have to do, which I think everybody wants, is (get) an accurate timeline and an accurate depiction of what occurred. That takes time."  The detective did say that authorities don't have any reason to believe that this incident is tied to anyting else.  "We believe, at this point, that (this is) an isolated incident involving road rage that ended in a tragic murder," he said.  CNN's Steve Almasy contributed to this report.
The man who allegedly killed a Las Vegas mother after a road rage confrontation remains at large. But that's not the only loose end in this case.