Someone mentioned "The Cowsills" a rather sad story, but interesting.
Anything by Ken Burns. His latest "The Roosevelts" was terrific and gave me a new appreciation for Eleanor Roosevelt, a true humanitarian, ahead of her time and was significant in the Civil Rights Act. I've heard rumblings that he's going to do a documentary of Marilyn Monroe, which some people think has been done to death, pardon the pun, but if anyone can do it well, it's Burns.
And then there's "Jinx", the HBO series documenting Robert Durst. Until it was aired, for some reason I thought he was dead and with him went the mysteries of the people he's suspected of killing, and why in hell did he dismember his neighbor who, astonishingly, he was acquitted of murdering, because he claimed it was self defense. Sociopathic freak, that one. At least he's off the streets and hopefully he won't be given bail because he's rich enough to pay it and smart enough to be a flight risk.