Take a close look at the first item here. It shows exactly how perverse the gun show loophole is—which, of course, has been staunchly defended over the years by the National Rifle Association. The killer, a felon who had just been released from prison, actually researched gun shows either just before or just after he killed his grandparents so that he could buy a gun without a background check. It boggles the mind. But no state can prevent someone from buying a gun elsewhere and bringing it across state lines. And the beat goes on.

Here is today’s sampling of gun violence.

—Joe Nocera and Jennifer Mascia

Michael Boysen, a felon suspected of killing his grandparents Friday night after they threw him a party upon his release from prison, was captured after a standoff with police at an Oregon hotel. Boysen, 26, was recently released from prison after a burglary conviction. Detectives learned from a search of computer data that Boysen had researched gun shows in Washington and Nevada, where sellers are not required to conduct background checks or maintain sale records. Boysen was apprehended after a standoff at the Westshore Oceanfront Suites in Lincoln City, Ore.

—Seattle Post-Intelligencer

A Florida woman allegedly shot and killed her ex-boyfriend during an unplanned encounter at a post office. Arianne Myles, 22, was driving near a post office in Jacksonville on Sunday afternoon when, by chance, she saw her ex-boyfriend, 23-year-old Harold Davis Jr.. She pulled her car behind his, retrieved a weapon from the back seat, confronted him and shot him numerous times. Police arrested her on the scene. Davis’s family said Myles had a history of harassing her ex.

—News4Jax

52-year-old Teresa Black was shot and killed by her son Tuesday morning. 22-year-old Brant Davis also injured his half-brother, 19-year-old Taylor Black, in the attack in a home in Carlin, Nev. The police chief said Davis was dazed and didn’t answer any questions about the incident.

—2News

A Moses Lake, Wash., boy, upset that he’d been grounded, is accused of shooting his parents with what police called a “family weapon”—a .22 caliber revolver kept in “a gun cabinet of sorts.” All six rounds were fired. Both parents were shot in the head but are expected to survive. The boy, 14, is being held on $500,000 bail and the prosecutor is deciding whether to send the case to adult court.

—MyNorthwest.com

Investigators with the Montgomery, Ala., Police Department are confirming the city’s 15th homicide of 2013. An unidentified 19-year-old male has died following a shooting in or near a home in West Montgomery. The victim was transported to an area hospital for treatment and later pronounced dead. Investigators have few leads.

—WSFA

A Sedgwick County, Kan., sheriff’s deputy was shot during a car chase Monday night. The chase that led to the shooting began around 6:16 p.m., and the deputy, 33, was hit by shotgun pellets on his right side, including his eye. His condition has been upgraded to fair. Jason C. Perez, 35, and Clara C. Crosser, 27, are being held in jail. Perez had spent time in prison for drug offenses and had been on parole.

—The Kansas City Star

A 13-year-old boy was dropped off at the hospital with serious gunshot wounds in East Oakland, Calif., Tuesday morning. He was interviewed by police, who learned that the shooting happened in the 1300 block of 66th Avenue at about 7:30 a.m. Police don’t know why it took the boy two hours to get to the hospital, as he has stopped cooperating.

—CBS 5

A Durham, N.C., teen was found lying on the side of the road with a gunshot wound Monday night. The victim and a friend were walking on Briggs Avenue when a green Cadillac Seville occupied by three people pulled up beside them. One occupant spoke to the victim and a shot was fired. Deputies arrested two occupants of the vehicle, Shelly Ann Polk, 30, and Victor Lavar Brown Jr., 17; a third suspect fled. The teen was taken to the hospital for treatment.

—The Herald-Sun

According to Slate’s gun-death tracker, an estimated 2,635 people have died as a result of gun violence in America since the Newtown massacre on December 14, 2012.

An earlier version of this post stated that Michael Boysen, a man suspected of killing his grandparents, was from Oregon. In fact, he is from Washington. The post also stated that Boysen shot his grandparents; in fact, the cause and manner of their deaths remains under investigation.