Who Killed Mary: A solve-it-yourself-novel

Mary Slater is dead, people. She died in the early hours of today.

The police aren't interested. They are saying no foul play. Which is totally absurd as it was
clearly death by a thousand cuts. A thousand men. Everyone seems to have played a
part. We saw the men. We all did. But still there is no suspect. Only a young dead female and her 1 million followers. No one wants to talk about it in real life. But everyone is talking about it online. Including you.

You don't just recognize her, you know her, as well as you know anyone. It's Mary. Your Mary. The Mary who
talked to you when no one else did through a phone screen as she went about her daily life. You want to avenge Mary and all the other Marys that have come before her. You want to catch the killer before they do it again. You saw Mary online for who she really was. Not an angry unhinged woman, a woman who needed saving. Like all
of us. And these men, they are all guilty in their own way but only one of them actually killed her.

Welcome, dear amateur sleuth to Who Killed Mary?