Напишите пожалуйста страшную историю из своей жизни нп английском

One day I went to the park and suddenly I saw a terrible woman . She was dressed in black dress, hat, shous and ecs...
I saw that she killed one boy. I was worried and screamed. Then I call to police and said about that.
It was terrible!!!
У меня конечно истории такой не было но достаточно правдоподобно))