#AMFAD: All My Friends Are Dead

Sarah accidentally shot Collette when she arrived unexpectedly at the cabin where Sarah had planned to kill Mona. Collette had publicly humiliated her, and Sarah wanted revenge. To cover up the accidental shooting, Sarah set the cabin on fire and framed it as a suicide, making it appear as though Collette's friends were responsible.

Earlier hints include Sarah's intense emotional reaction to discussions about Collette and her secret relationship with her.

The masked killer is revealed to be Officer Shaw, a police officer who appears to help the group after their van breaks down. However, she is working with Sarah in a revenge plot against the friends they blame for Collette's death.

Officer Shaw's suspiciously quick arrival and insistence they shelter in the remote house hints at her true role.

Sarah kills Mona because Mona was primarily responsible for bullying Collette, including making a fake bulimia video that humiliated her publicly. Sarah views Mona as the main culprit behind Collette's emotional torment and subsequent death.

Earlier tension between Sarah and Mona highlights their conflicting histories with Collette.

Liv attempts to leave the house but is captured by the masked killer. She is then livestreamed being tortured, with the killer pouring a burning liquid on her. Her ultimate fate is left ambiguous, though the implication is she does not survive.

Liv's attempt to leave alone despite the danger sets up her capture.

Officer Shaw becomes an ally to Sarah because they share a common goal: revenge against the group for what they did to Collette. Shaw was connected to the original SDSK murders from twenty years earlier and helps Sarah orchestrate the killings while framing it as the killer's return.

Shaw's knowledge of the house and the SDSK note foreshadows her deep involvement.

Sarah was in a secret romantic relationship with Collette. This hidden love explains Sarah's intense motivation for revenge when Collette died. The relationship was never revealed to their friends, adding to the complexity of Sarah's grief and anger.

Sarah's emotional responses to discussions about Collette hint at a deeper connection beyond friendship.

Twenty years before the events of the film, seven students were murdered according to the seven deadly sins in a case that remained unsolved. Detective Russell Daniels had investigated these original murders, and the killer uses the same MO to target the group, framing it as a return of the SDSK Killer.

The unsolved murders mentioned at the festival's return create the backdrop for the night's events.

The group bullied Collette, with Mona leading the harassment. Mona created a fake bulimia video to publicly shame Collette, and the entire group participated in cruel behavior that drove Collette to emotional breakdown. This bullying directly contributed to Collette's decision to end her life, or so they believed until the truth came out.

Will's explanation of Collette's past and Liv's hints about Mona's manipulations set up the reveal.

Two years before the film, Collette died in a cabin that the group used as their clubhouse. It was ruled a suicide, but the basement video reveals that Sarah actually shot Collette accidentally and then set fire to the cabin to cover up the shooting, framing the friends for her death.

The basement recreation of the cabin and the surveillance videos directly address this event.

After Sarah eliminates Shaw and believes she's gotten away with the murders, she receives a phone call from the real SDSK Killer, the original perpetrator from twenty years ago. The killer threatens to come for everyone Sarah knows, revealing that the true SDSK Killer is still out there and the cycle of violence is not over.

Detective Russell Daniels mentions the original case remains unsolved, foreshadowing the killer's continued existence.

The killer targets each friend based on a specific sin: Guy is killed for Gluttony, the couple are targeted during Lust, and so on. The shots they drink correspond to their assigned sins, creating a themed murder game that connects to the original SDSK case and the concept of divine punishment for their wrongdoing.

The shot glasses themed to the seven deadly sins set up this pattern from the beginning.

Aaron arrives at the house seeking Sarah but instead discovers the bloody aftermath of the killings. He is later stabbed repeatedly by the killer in the basement, dying from his injuries. His death adds to the mounting body count as the night progresses.

Aaron's arrival after the violence has already begun places him directly in danger.

Will is killed in the basement when the killer strikes him with an axe, beheading him in a brutal attack. This violent death occurs shortly after the group watches the videos revealing their past actions against Collette.

The basement sequence builds tension before Will's violent demise.