In 2014 a Jamaican phone scammer threatened to kill a retired American man named William Webster when he wouldn't fall for the scam. The scammer didn't know Webster was the former director of both the FBI and CIA. He was arrested when he flew to NYC in 2017 and sentenced to 6 years in prison.
According to the government’s evidence, Thomas, posing as “David Morgan,” placed a call on June 9, 2014 to a man who lived and worked in the District of Columbia. Thomas told the man that he was the head of Mega Millions and that the man was the winner of $15.5 million and a 2014 Mercedes Benz. Thomas told the man that the man needed to pay $50,000 to cover the taxes before the award was provided to him.
Note that Webster immediately realized this was a scam, but played along and gathered info to get the man arrested
The threat of murder was important because it made it very easy to prosecute him. He apparently had made a number of threats like that to people