Answer:
Private Hugh Montgomery.
Step-by-step explanation:
He was found guilty of making the first shot in the Massacre and was indicted for murder.
The Boston Massacre was a confrontation between British soldiers and a mob that was harassing them.
Montgomery along with other private were the only ones convicted but they avoid the death sentence. They receive a reduced sentence, they got branded on their thumb with a hot iron with the letter "M" for murder.
I hope this answer helps you.