go watch Dear Zachary:A Letter to a Son About His Father. Its currently on Netflix and is a documentary made to explain and share the life of about a man who was murdered by his ex to their son and, avoiding spoilers (which I'm very glad I was clean of before watching) the response of his friends and family along with the events covering the next few years as they learn said ex was pregnant. It was filmed by his friend and consists heavily of just intensely intimate interviews and older footage/photos, and easily has some of the best developed tone and pacing I've seen in a while from docus in this vein. I really recommend it, but its definitely a roller coaster as far as your heart goes, so be aware.

My only complaint is that it got a little faith-y towards the end, which is by all means understandable and probably even preferable to many viewers, but pretty always takes me out of things and makes them feel pretty damn squicky. That's an entirely different conversation, though.