The death of Alexey Navalny, Putin's most vocal critic

Officials said Russian opposition leader Alexey Navalny collapsed and died Friday inside a high-security penal colony above the Arctic Circle, where he'd been serving a 19-year sentence for “extremism.“ Correspondent Seth Doane reports on the life of a fierce crusader against corruption who'd staged massive protests against President Vladimir Putin, and who'd already survived notorious attempts to silence him. “CBS News Sunday Morning“ features stories on the arts, music, nature, entertainment, sports, history, science and Americana, and highlights unique human accomplishments and achievements. Check local listings for CBS News Sunday Morning broadcast times. Subscribe to the “CBS News Sunday Morning“ YouTube channel: Get more of “CBS News Sunday Morning“: Follow “CBS News Sunday Morning“ on Instagram: Like “CBS News Sunday Morning“ on Facebook: Follow “CBS News Sunday Morning“ on Twitter: Subscribe to our newsletter: Download the CBS News app: Try Paramount free: For video licensing inquiries, contact: licensing@