Young woman and her boyfriend were at some sort of half-assed campground that passes for a resort in Brazil, staying in a rented room or cabin of some kind. Drama arose over her flirting with another man. Drama led to rage. Rage led to violence.
In this case, violence manifested itself with the fellow brandishing a long arm of some sort and putting one through the girl's knee in order to prevent her from leaving before he'd said his piece.
People at the nearby cabins reported that they heard her screaming in pain and begging for help, as well as him ranting and raving about her fucking other guys. When they tried to approach to offer aid, he threw open the door and took a few random shots to warn off would-be white knights.
They reported that he deliberately left the cabin door open during the episode in order to torment her with the illusion of nearby safety and freedom. Eventually he got bored of ranting about her putting it out all over town, walked around behind her, and shot her in the back.
He then fled into the woods, keeping interlopers at bay with the rifle. Police arrived shortly thereafter, but the girl had already died on the cabin floor after enduring almost 20 minutes of agony with a bullet in the knee.