Answer:
Dear Sir,
I wanted to inform you someone in my (whatever) class has been stealing. It has been ongoing and when I began to question him about it he denied it. After this I received a threat via text which I assume is him. If I may suggest catch him in the act so he cannot deny it and then phone his parents. I hope this can be figured out and it can not be a distraction to other students.
Thank you for your time,
(Name)
Explanation:
Hope this helps
