Before He Died in Prison, Aleksei Navalny Wrote a Memoir. It’s Coming This Fall.

During the years leading up to his death in a Russian prison, Aleksei A. Navalny, the Russian opposition leader, was writing a memoir about his life and work as a pro-democracy activist.

Titled “Patriot,” the memoir will be published in the United States by Knopf on Oct. 22, with a first printing of half a million copies, and a simultaneous release in multiple countries.

Navalny, who rose to global prominence as a fierce critic of President Vladimir V. Putin of Russia, resisted the Kremlin’s repeated attempts to silence him through physical harm, arrests and imprisonment in a remote Arctic penal colony, where he died in February, at age 47.

The book, telling his story in his own words, comes as final show of defiance, his widow, Yulia Navalnaya, said in a statement, and could have a galvanizing effect on his followers.

“This book is a testament not only to Aleksei’s life, but to his unwavering commitment to the fight against dictatorship — a fight he gave everything for, including his life,” Navalnaya said. “Through its pages, readers will come to know the man I loved deeply — a man of profound integrity and unyielding courage. Sharing his story will not only honor his memory but also inspire others to stand up for what is right and to never lose sight of the values that truly matter.”

In a news release, Knopf said that the memoir “expresses Navalny’s total conviction that change cannot be resisted and will come.”