Trent Brewer drove to a parking lot, planning to sell some weed. The transaction never happened.
Police in Springfield, Mo., found Brewer, 23, face-down in a pool of his own blood with no pulse on Dec. 12. He was declared dead at a nearby hospital.
Police say Darian Earl Hall, 18, pulled out a chrome semi-automatic handgun before the sale could happen, and opened fire on Brewer as he began to run away.
Hall has denied shooting Brewer, blaming another teen who was with him at the time. What exactly happened will eventually be settled in court.
Brewer's story follows a familiar pattern: drugs, an escalating confrontation and the presence of a gun leading to a death.
Beatriz Cintora-Silva took refuge at her sister's home immediately after telling police in Longmont, Colo., that her ex-boyfriend had kidnapped her, threatened her and threw her into a car dashboard. It was Saturday, Dec. 16.
The next day, police arrested Daniel Sanchez, 31, who spent Sunday night in jail.
Six hours after Sanchez left the Boulder County jail, a call came into 911:
"No, no, no, please, no," Cintora-Silva said on the call.
Gunfire rang out and the phone went silent.
Then, Sanchez picked up the phone.
"I just shot everyone right now," he said, according to a recording of the 911 call.
"You just shot everybody?" the dispatcher asked. Sanchez calmly replied "Yeah."
She asked for his name, but he didn't answer.
"I'm going to shoot myself right now," Sanchez said on the recording. The dispatcher pleaded with him.
It didn't matter. The line went dead.
Sanchez had shot and killed Cintora-Silva, her sister and her sister's husband before killing himself with one of the most deadly weapons in the United States.
It wasn't an AR-15, or an assault rifle -- it was a Glock .45-caliber handgun.
America's most deadly firearm
Trent Brewer and Beatriz Cintora-Silva are among the more than 6,000 people killed each year by handguns.
That's like having a massacre on the scale of Newtown 239 times during one year.
Yet, as the Obama administration moves forward with legislation to stem the toll of gun violence in America, the focus has been on curbing access to high-powered rifles and large-capacity magazines, not the common handguns that account for the majority of gun deaths in America.
Last week, Sen. Dianne Feinstein, D-Calif., stood in front of an array of assault rifles and semi-automatic weapons and outlined her proposed legislation to reinstitute an assault weapons ban, as well as outlaw ammunition magazines that hold more than 10 rounds.
But even if these proposals make it through to legislation, what impact will they have on stemming the deaths by America's most deadly firearm?