Bertha Jorkins

"Listen, I know Bertha. She was a year above me and your father and she was an idiot. No brains at all. She'd be very easy to lure into a trap"

- Sirius Black

Bertha Jorkins was a Ministry of Magic employee who worked in the Department of Magical Games and Sports before her death in 1994.

Bertha unwittingly uncovered Bartemius Crouch's secret seclusion of his son, Barty, which caused Crouch to panic and cast on her a memory charm so strong that it caused brain damage.

When she went on vacation to Albania, she encountered Wormtail, who overpowered her and took her to Lord Voldemort. who broke through the Memory Charm that Barty Crouch Sr had placed upon her, when she had discovered his secret that he was keeping his convict son, Barty Crouch Jr. hidden in his house. As she worked in the Department of Magical Games and Sports, she also knew about the plans for the Triwizard Tournament. Voldemort would use all this information against Harry Potter in a plot for his murder.

After he had extracted all useful information from her, Voldemort murdered Bertha. He then began his plans for his new ressurection scheme. He decided to use Bertha's murder to turn Nagini into a Horcrux, since her murder was the first he committed with his new rudimentary body, after over a decade of inability to wield a wand.

Trivia

 * Bertha appeared in the Penseive from one of Albus Dumbledore's memories regarding Severus Snape's schoolboy years.
 * Bertha was one of the ghost-like apparitions that came from Voldemort's wand when he and Harry dueled at the Little Hangleton graveyard. She, along with the other apparitions, distracted Voldemort and encouraged Harry, thus enabling Harry to get to the Triwizard Cup portkey and escape back to Hogwarts.