The Fall of the House of Usher: How did Frederick die?

In the seventh episode of The Fall of the House of Usher, titled "The Pit and the Pendulum," Frederick Usher meets his demise. Frederick, the oldest of Roderick Usher's children and the heir apparent to the family's entrepreneurial empire, is portrayed as a cruel and evil character throughout the episode. He is finally punished for his actions, marking his downfall.The episode reveals several secrets and backstory, shedding light on the mysterious curse surrounding the Usher family and their connection to Verna. It is revealed that young Roderick had betrayed Dupin by signing forged papers for clinical trials at Fortunato Pharmaceuticals. However, during a court hearing, Roderick throws away his collaboration with Dupin and claims to have signed the papers himself. This leads to his arrest for perjury, devastating his wife Annabel.In the present day, Madeline, Roderick's sister, tries to convince Arthur Pym to back her as the new CEO of Fortunato Pharmaceuticals. She believes she can steer the company away from addictive drugs and into the realm of artificial intelligence and virtual immortality. However, Madeline is tormented by the death of her sister Tamerlane and her encounter with Verna.Madeline attempts to amend her agreement with Verna and even tries to kill her, but Verna proves to be indestructible. They discuss a mysterious contract that can only be fulfilled through death. Madeline convinces Roderick that the only way to fulfill the contract is for him to kill himself with a Ligodone overdose. However, as Madeline leaves, Verna awakens Roderick, preventing his escape from his fate.Meanwhile, Frederick, eager to become CEO, decides to proceed with demolishing the lab where Prospero held his party. He continues to torture his wife, Morelle, with nightshade paralyzing drugs and disfiguring her mouth with pliers. Verna, appalled by Frederick's cruelty, whispers in his ear and adds the paralyzer to his cocaine stash.As Frederick goes to the demolition site, he accidentally snorts the paralyzer and falls to the floor. Verna confronts him about his actions and uses a walkie-talkie to imitate Frederick's voice, giving the demolition crew the okay to bring down the building. A swinging beam slowly descends, splitting Frederick's body in half and ending the line of Usher children.However, this does not spell the end of the Usher dynasty, as Lenore, Roderick's granddaughter, is still alive. Throughout the episode, it is hinted that Madeline has been experimenting with Lenore in her basement, and she may have turned her into something other than human or even something other than living."The Pit and the Pendulum" is a gripping episode that uncovers secrets, showcases the evilness of the Usher family, and culminates in Frederick's gruesome death. It sets the stage for the final episode, leaving viewers wondering what fate awaits the remaining Usher family members.