How to petition a minor murderer, how to write a letter explaining to the police?

We don’t know the specific situation

So we don’t know how to write the beginning for you. . .

I am an ordinary student in a certain school, and I am a classmate of a certain person in the same class. . .

Everyone was shocked and regretful about what happened to a certain classmate. .

How is a certain classmate doing in school?

Then talk about the person who was killed and say that he really deserves to be killed. . .

But no matter what. . .

I hope the uncles and aunts from the Procuratorate and Court of a certain Public Security Bureau can help a certain classmate

Finally

Sincerely yours

A certain Public Security Bureau

A certain procuratorate

A certain court

The petitioner. . .