Bertha Jorkins was useful to Voldemort because she provided him with valuable information about Barty Crouch Jr.'s whereabouts and plans while under the Imperius Curse. Voldemort used this information to aid his return to power and to further his plans to regain strength and followers.
Bertha Jorkins was known as a gossip. He was able to pull useful information from her, before he killed her.
Barty Crouch Sr. placed a memory charm on her when she found out the secret that Mr. Crouch and his family kept Barty Crouch Jr. trapped inside. Voldemort was brought Bertha by Peter Pettigrew, and Voldemort broke the charm by torturing her with the Cruciatus Curse. At the same time that he learned about Crouch Jr, he learned valuable information about the Triwizard Tournament going on at Hogwarts.
Bertha Jorkins was a witch who worked for the Ministry of Magic in the Department of Magical Games and Sports. She went missing in 1994 during a holiday to Albania, although her reputation for being stupid and forgetful meant that her head of department, Ludo Bagman, didn't think her disappearance was anything to worry about.In actual fact, it was something to worry about as she had bumped into Peter Pettigrew who the Ministry believed to be dead. Peter persuaded Bertha to follow him and he led her straight to Lord Voldemort. Voldemort broke through a memory charm that had been placed on her by Barty Crouch Sr and learned that one of his death eaters, Barty Crouch Jr, was alive. Voldemort also discovered that the Triwizard Tournament would be held at Hogwarts that year. After discovering this, Voldemort killed Bertha.
Lord Voldemort's wand was forced to show the last spells the wand cast, the longer the connection between the wands went on the further back the spells went. The wand showed the following figures; the hand created for Wormtail, Cedric Diggory, Frank Bryce, Bertha Jorkins, Lily Potter and James Potter. In the movie adaption, the hand and Bertha Jorkins do not appear.
Different methods. Expelliarmus was quite useful more than one times.
Lord Voldemort killed muggle Frank Bryce in the Riddle Mansion at the start of the book. Frank had overheard him talking about murdering someone else who turned out to be Bertha Jonkins, she was killed in Albania before the events of the fourth book. At the end of the book, Voldemort orders Peter Pettigrew to kill Cedric Diggory. This happens in the graveyard in Little Hangleton, next to the Riddle Mansion.
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