The planned premiere of the latest true crime documentary series “Helter Skelter: An American Myth” (Epic, 10 p.m.) last month was delayed because the world was ablaze in police violence and Black Lives Matter protests. Charles Manson wanted to start a race war too in his day. 

Seems like his story has been told a lot, but this one, coming six weeks late, and clocking in at six hours, is meant to be a definitive story of the murders that seemed to put an end to 1960s hippie bliss. Former family members give new interviews, but mostly there’s a lot of of recreations by the team under Greg Berlanti, responsible for so many current TV shows, including CW’s entire roster of DC comics shows, as well as “Riverdale” and “All American.” There seems to be more than a few visual suggestions from Quentin Tarantino’s “Once Upon a Time .. in Hollywood” as well.  

After a two year absence, the inventive “Wynonna Earp” (Syfy, 10 p.m.) returns for its fourth season. 

Anna Nawaz of the PBS NewsHour hosts the new series “Beyond the Canvas” (PBS, 10:30 p.m., check local listings), which is about the arts, but not necessarily the visual arts. Instead, its four episodes will concentrates on interviews with famous singers, actors and movie stars. 

Now that “Perry Mason” (HBO, 9 p.m.) is a lawyer, Emiliy’s trial can begin. 

The work continues without Michelle on “I’ll Be Gone in the Dark” (HBO, 10 p.m.).