When does Zoo return?

Zoo is an American drama television series based on the 2012 novel of the same name by James Patterson and Michael Ledwidge. The series stars James Wolk, Kristen Connolly, Nonso Anozie, Nora Arnezeder and Billy Burke as a group of varied professionals who investigate a mysterious outbreak of violent animal attacks upon humans all over the world. Zoo premiered on June 30, 2015, on CBS. CBS renewed the series for a third season in August 2016, which aired between June 29 and September 21, 2017. CBS announced the series had been cancelled after three seasons.
Jackson Oz, an American zoologist and his Kenyan friend, Abraham Kenyatta, a safari guide, and a French intelligence agent, Chloe Tousignant, all seek to investigate the mysterious pandemic as the attacks become more coordinated and ferocious.