The story of Aaron Hernandez was both tragic and bizarre. He’d fulfilled a dream held by millions, achieving football superstardom, a multimillion dollar contract, a trip to the Super Bowl with the New England Patriots. And yet it all collapsed, amid horrifying evidence that implicated him in multiple murders. Netflix’s latest true crime documentary event, the three-part Killer Inside: The Mind of Aaron Hernandez, offers a gripping and detailed examination of the case. So here’s what you need to know.