Man arraigned for sending letter bullets as threat to kill his victim

It sounds like a serious and disturbing case. Here's a summary of the situation:

A man has been arraigned for allegedly sending a letter with bullets as a threat to kill his victim. This is a very concerning and potentially dangerous situation, as it involves the use of violence and intimidation to harm someone.

Can you tell me more about the case? Who is the man accused of sending the letter, and what is the relationship between him and the victim?