Lazarus: Who killed Cassandra in the Prime video thriller series? Details explored 

If you've watched Lazarus on Prime Video, then you know you've gotten yourself into watching and experiencing a maze of secrets, grief, and minds that are twisted to the very T.

However, one of the most chilling mysteries of the show revolves around the death of Cassandra. The truth about who murdered her? That's a bit of a doozy because Cassandra was killed by none other than Jonathan Lazarus, Joel's own father.

Under all of his calm and psychiatrist front that he put up for so long, Jonathan was actually a serial killer all along, and he constantly hid behind the pain of his patients.

Now, what seemed like a therapist helping the broken was actually a man deciding who deserved to live and who deserved to be killed.

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Jonathan’s dangerous secret and Cassandra’s tragic fate in Lazarus

From the very beginning, Lazarus made Cassandra's story feel unsettling. When we think about her, she was more than just another patient. She trusted Jonathan with her deepest secrets, especially after she revealed that she murdered her boyfriend, Neil, and instead of reporting her crime, Jonathan helped her cover it up, tying their lives together in the worst way possible.

For him, Cassandra became a "project", someone whom he could easily manipulate to feed his twisted sense of mercy.

As Joel finds out about the older therapy tapes and interviews, the truth all starts to float up like an extremely bad never never-ending nightmare. Now here's the catch: Jonathan did not just help Cassandra but...he also took her life (oops). His reasoning? horrible. His act? also horrible.

He believed that he was "saving" his patients from pain, choosing and picking those whom he thought couldn't be fixed. Cassandra, once a victim of her own guilt, became just another name on Jonathan's long list of victims.

Her death wasn't out of rage but part of Jonathan's deluded mind that killing was a form of healing and helping.

The many layers around Cassandra's death show how Jonathan blurred the line between moral therapy and inhumane torture. What makes her murder even more tragic is how personal it felt. She trusted him completely, unaware that the man she confided in would be her executioner.

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The haunting aftermath and Joel’s shocking discoveries

When Joel starts digging into his father's past in Lazarus, he does not expect to find Cassandra's name being linked to the horror. Her ghost (whether actually present or just a figment of his imagination) starts to appear to him, pushing him to dig deeper and find out the truth.

Every tape that he ends up playing, each one of the lies that he comes to face with, leads him closer and closer to realizing his father's monstrous double life. Jonathan had been killing patients like Cassandra, Imogen, and Harry for years, all while framing others to cover up his crimes.

The final pieces all come together when Joel listens to the conversations between Jonathan and Detective Alison Brown. Alison had unknowingly helped Jonathan hide the murders, believing his stories about his unstable patients.

But when she confronts him about Cassandra and Imogen's deaths, Jonathan does not seem to deny it. In fact, he talks about how he has set them free, and this is the mindset that defines his terrifying logic.

Cassandra's murder becomes the very turning point that exposes Jonathan's entire web of lies he's made up in his own mind. Her death brings forward the idea that healing is rooted in control and cruelty.

Even after Jonathan’s suicide, his darkness doesn’t end. Joel’s son, Aidan, begins to mirror his grandfather’s violence, showing that the Lazarus family curse might not be over yet.

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Cassandra’s death in Lazarus is the very key that unlocks the entire nightmare. Her story exposes Jonathan Lazarus as a man who thought playing god was the same as doing good.

And even in death, his choices infect everything that follows. By the time Joel uncovers the truth, it’s too late, and the violence that started with Cassandra has already taken root in the next generation.

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