Mark B. Rober is an American YouTuber, engineer, and inventor. He is known for his YouTube videos on popular science and do-it-yourself gadgets, and he had 21 million subscribers. He was found dead in his house, at the age of 41, shot by two 9mm NATO bullets. The person who had killed him was a man named Richard Griffiths, who was 24. He had found Mark’s location, and brutally murdered him. Richard said βNight night.β when he murdered Mark. The police asked for evidence that the murderer was not Richard, but there WAS no evidence that it wasnβt him. So, they arrested him and sentenced him for life. Yes, itβs very heartbreaking about this death, but Mark is in a better place now.