WHO KILLED GARRETT PHILLIPS? 8 p.m. on HBO; stream on HBO platforms. For years, Potsdam, a small town in upstate New York, was consumed with a case that seemed crystal clear to so many residents. In 2011, 12-year-old Garrett Phillips was strangled to death in his home. The police identified Oral Nicholas Hillary, a soccer coach and a former boyfriend of Phillips’ mother, as the primary suspect. Hillary said he was innocent. But he was charged with second-degree murder in 2014, despite the lack of conclusive forensic evidence. The county prosecutor said the investigation was over, but two years later, Hillary was acquitted. In this new two-part documentary, those involved with the case unpack why Hillary was swept up in it and point to questions that remain unanswered.

CASH PAD 10 p.m. on CNBC. The hosts Jordan Rodgers and JoJo Fletcher (of “The Bachelorette”) help homeowners spruce up and transform their properties into coveted short-term rentals in this new series. The show begins with a married couple in Stonewall, Tex., who want to give their empty cottage a second life.