Three deaths between two PCs. Currently near the end of Book 4 in the anniversary edition.
Character: Vale, Dreamthief Changeling Alchemist (Vivisectionist) 6/Mortal Usher 1.
Adventure: The Skinsaw Murders
Location: E1: The Scarecrow's Lair
Catalyst: Overconfidence, one lucky crit.
Story: The party did not notice Scarecrow hiding, so it stepped out after the party began to spread out and search the ground floor of The Shadow Clock. The awakened flesh golem drew their scythe and slashed at the party's healer, narrowly missing her.
Vale then attempted to change forward and make a claw attack, hoping to draw attention away from the fragile healer. Unfortunately, the player forgot to refresh their defensive buffs before entering the building. Unfortunately, the player decided that they would take the attack of opportunity. Unfortunately, the Scarecrow rolled a natural 20, then another. As is often the case with high crit weapons, I dealt enough damage with the x4 crit scythe to instantly kill Vale, slicing her from shoulder to hip in a single, neat cut.
The party then finished the fight, took Vale's neatly-bisected body, and went off to the church of Sarenrae to spend all their hard-earned rewards for the book to buy a single raise dead scroll, which the healer (a Kitsune Oracle) used to bring Vale back.
Character: Vale, same race, Alchemist (Vivisectionist) 6/Mortal Usher 4.
Adventure: The Hook Mountain Massacre
Location: D1: The Entrance
Catalyst: Ogre Fighter getting a lucky crit.
Story: Not much, just a lucky crit on an already-injured character proving lethal. Healer had not yet learned breath of life, leading to a side adventure to restore the alchemist to life.
Character: Andêl, Archon-blooded Aasimar Unchained Monk (Scarred Monk) 11. I house-ruled that the player could take that archetype with the Unchained variant, despite it not being normally compatible.
Adventure: Fortress of the Stone Giants.
Location: B3: The General's Lair
Catalyst: Underestimating Galenmir's damage output while in a tactically strong position.
Story: Andêl was scouting ahead of the party, when they noticed Galenmir approaching from his Lair after being alerted to intruders. He was in a narrow passage, meaning he could not move much, so he decided to stand his ground there.
Andêl then attacked Galenmir, using their Scarred Monk abilities to inflict damage back upon Galenmir as they were hit repeatedly. Unfortunately, the healer was unable to close in and heal Andêl due to the narrow caves, and the sudden appearance of Enga the Kobold Barbarian to provide backup meant that Galenmir could continue making full attacks until one finally dropped Andêl. Breath of life managed to save the day, and the party then had to rest and recuperate after that one.