KHIMKI, Russia — Mikhail Beketov had been warned, but would not stop writing. About dubious land deals. Crooked loans. Under-the-table hush money. All evidence, he argued in his newspaper, of rampant corruption in this Moscow suburb.

“Last spring, I called for the resignation of the city’s leadership,” Mr. Beketov said in one of his final editorials. “A few days later, my automobile was blown up. What is next for me?”

Not long after, he was savagely beaten outside his home and left to bleed in the snow. His fingers were bashed, and three later had to be amputated, as if his assailants had sought to make sure that he would never write another word. He lost a leg. Now 52, he is in a wheelchair, his brain so damaged that he cannot utter a simple sentence.

The police promised a thorough investigation, but barely looked up from their desks. Surveillance videos were ignored. Neighbors were not interviewed. Information about politicians’ displeasure with Mr. Beketov was deemed “unconfirmed,” according to interviews with officials and residents.