A 64-year-old man was beaten to death on a New York City subway on Tuesday by a sword-wielding monster with at least 33 prior arrests. David Mazariegos, 25, beat a complete stranger to death on the subway in downtown Brooklyn because he didn’t like the way he looked at him. Mugshot of a young man with short hair and a mustache, displaying a serious expression against a neutral background. NYC subway killer David Mazariegos According to reports, Mazariegos became angry after the unidentified victim held the subway doors open for him. The act of kindness set him off and he...