HBO Max first to confirm a docu-series.Campfire Studios confirmed to The Post on Friday it has been commissioned to produce a “multi-part doc series” for the streaming giant.The series “will investigate the mysterious, still-unraveling events” that started in June, when then-powerful lawyer Alex Murdaugh found his wife and 22-year-old son shot dead near their weekend hunting lodge in Islandton, the production company said.Now “national networks, Hollywood production companies and global