‘Murder on Middle Beach’ director was ‘willing to do whatever it takes’ to probe mom’s murder

Madison Hamburg has spent a decade wondering who killed his mom and why. But it wasn’t until he made a documentary about her that he got to know who she really was. With HBO’s four-part docuseries, “Murder on Middle Beach,” which premiered Sunday, the 29-year-old Connecticut director explores the life of his mother, Barbara Beach Hamburg, as well as the many theories surrounding her brutal …