The central mystery of Pretty Little Liars hinges on a single, haunting question that drove fans wild for years: who actually killed Alison DiLaurentis? The twist-filled narrative spans seasons of red herrings, fake deaths, and elaborate cover-ups. Let's cut straight to the facts: Alison DiLaurentis wasn't actually murdered at all on the night she disappeared. Instead, the person who struck her over the head with a rock was Mona Vanderwaal, acting in a desperate psychotic break, while her mother, Jessica DiLaurentis, buried her alive to protect the attacker.
The confusion stems from the fact that a body was found in Ali's grave—Bethany Young, who was murdered that exact same night by Mona's former tormentor turned ally, Melissa Hastings, who mistakenly buried her thinking she was Alison. If you've felt turned around by the show's dizzying timeline, you aren't alone. Let's unpack the exact sequence of events, why the Rosewood police got it wrong, and how the labyrinthine plot finally unravels.
The Fateful Night: Separating Fact from Fiction
To understand what happened in Rosewood on Labor Day weekend, we have to look past the official police reports and town gossip. That night featured multiple parallel altercations involving Alison, creating a chaotic chain of events that left one girl dead and another buried alive.
Alison spent her final hours before disappearing tormenting several people in town, including Aria, Hanna, Emily, Spencer, and Mona. She also met secretly with Ian Thomas, Byron Montgomery, and Wilden. However, the critical violence occurred in rapid succession behind the DiLaurentis home.
- Mona's Attack: Mona lured Alison out to the backyard pit wearing the signature Black Hoodie. Driven by a desire to get rid of the queen bee who had ruined her life and stolen her identity, Mona struck Alison across the back of the head with a heavy rock, knocking her unconscious.
- Jessica's Cover-up: Mrs. DiLaurentis witnessed the attack from her living room window. Believing Alison was dead and terrified of what Mona or the police would do, Jessica dragged Alison's body to a shallow grave she had just dug and buried her alive. (Alison was later pulled out by Mrs. Grunwald, who rushed her to the hospital before Alison ran away to go into hiding.)
- Melissa's Mistake: Meanwhile, Spencer had a physical confrontation with Alison near the gazebo. Spencer blacked out from prescription pills and exhaustion, walking away before any fatal blow was struck. Later that night, a panicked Melissa Hastings stumbled upon what she thought was Alison's lifeless body in the yard. Believing Spencer had killed her in a drug-fueled rage, Melissa buried that body to protect her sister—unaware that the victim was actually Bethany Young, who had escaped from Radley Sanitarium wearing identical yellow tops.
Why the Rosewood Police and the Liars Stayed Clueless
For seasons, the characters and viewers chased ghosts. The town assumed Alison was dead because the dental records matched the body pulled from the grave. But why didn't anyone check closer?
The Rosewood Police Department was notoriously corrupt and incompetent. Detective Wilden covered up crucial evidence because he was being blackmailed by Alison and later by CeCe Drake. Furthermore, the girls themselves were trapped in a psychological web woven by "A."
When Alison finally returned in Season 5, she revealed she faked her death to escape her tormentor. But her return didn't solve the murder mystery of the girl in her grave—Bethany Young. That investigation dragged on, pulling in new suspects like Toby Cavanaugh, Ezra Fitz, and Jenna Marshall, each hiding secrets that made them look guilty on paper.
The Real Identity of Big A and the Final Truth
As the series progressed toward its explosive summer finale in Season 6, the identity of "A" and the truth behind Bethany Young's murder came to light. CeCe Drake—born Charles DiLaurentis, later known as Charlotte—was revealed as the mastermind behind the torment.
Charlotte was also connected to the fateful night. In flashbacks, it was revealed that Charlotte hit Alison with a rock that exact same night, believing Alison was Jessica (whom Charlotte resented for institutionalizing her). Because multiple people struck someone with a rock that night, the show relied on the confusion of simultaneous attacks to keep viewers guessing. Ultimately, Mona struck Alison first, and Jessica buried her. Bethany Young was the unfortunate casualty who paid the price for the identical yellow shirts and the chaotic web of family secrets in the DiLaurentis household.
Common Misconceptions About the Rosewood Murder
Fan forums and rewatch discussions often get tripped up by the show's fast-paced continuity. Here are a few clarifications on common points of confusion:
- Did Spencer kill anyone? No. While Spencer convinced herself she might have killed Ali during her prescription drug addiction blackouts, she only threatened Ali with a shovel handle before walking away.
- Who killed Bethany Young? Melissa Hastings buried Bethany alive, but the autopsy report later proved that Bethany died from the blunt force trauma to her head inflicted by Mona Vanderwaal, who mistook Bethany for Alison in the dark.
- Why did Alison stay away for years? Mrs. Grunwald warned Ali that someone in Rosewood wanted her dead. Fearing for her life, Ali used the opportunity of her disappearance to reinvent herself and run away, living on the road with the help of Mona's initial intel.
Frequently Asked Questions
Did Alison DiLaurentis actually die in the show?
No. While the town of Rosewood held a funeral and mourned her for years, Alison survived the attack and went into hiding. The body in her grave belonged to Bethany Young.
Who was inside the grave instead of Alison?
The body in the grave was Bethany Young, another patient from Radley Sanitarium who had snuck out of the facility wearing the exact same yellow top as Alison on the night of the disappearance.
Why did Mona try to kill Alison?
Mona suffered from severe psychological distress and felt utterly destroyed by Alison's relentless bullying. She wanted to eliminate the tormentor and step into her social shoes, leading to the attack in the backyard.
How did Alison manage to stay hidden for so long?
With financial help, forged IDs, and later assistance from Mona—who tracked down runaways and helped orchestrate the fake kidnapping persona—Alison moved from town to town under various aliases until the threats forced her to return to Rosewood.
