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At the end of Promising Young Woman,

when the police comes to arrest Al, how do they know he is the killer?

I can imagine they discovered the necklace and what remained of the body, but at this point wouldn't everybody at the party be a suspect? The video of Nina can at best make him the main suspect. Before the police arrests him, I think they would at the least need to talk with everybody at the party.

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As explained by EW:

He's ultimately arrested because Cassie had a backup plan (a cache of incriminating emails and texts set to disperse in the event of her death), but the ending still stings — and that's exactly what Fennell wanted.

Variety details:

As a Plan B, she’s sent evidence of Nina’s sexual assault to Al’s former lawyer (Alfred Molina), who would very much like to repent for the choices he made as an attorney years ago. Whatever Cassie sent as proof of her disappearance (we never see it), the police find her remains.

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  • I can understand she had evidence but she couldn't have provided evidence of who the killer is.
    – martinkunev
    Commented Sep 4, 2021 at 20:34
  • @martinkunev Not only did she collect evidence, she had potentially very incriminating material from the lawyer.
    – matt_black
    Commented Sep 9, 2021 at 0:38

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