MOSCOW -- The only official charged with the death of a Russian whistle-blowing lawyer walked free Friday after a Moscow court acquitted him of negligence. The case has become a rallying point for human rights advocates and sparked escalating tensions and legislation in the United States and Russia.

Sergei Magnitsky died in jail in 2009 after his pancreatitis went untreated, and an investigation by Russia's presidential council on human rights concluded he was severely beaten and denied medical treatment. Prison doctor Dmitry Kratov was the only person to face trial.

Judge Tatyana Neverova said she found no evidence that Kratov's negligence could have caused the lawyer's death. The acquittal was widely expected after prosecutors this week dropped their accusations, saying there was no connection between Kratov's actions and Magnitsky's death.

The case has angered Russian activists and the West. The U.S. Congress passed legislation this month in Magnitsky's name, calling for sanctions against officials -- including Kratov -- deemed to be connected with human rights abuses. Moscow's retaliation includes a measure barring Americans from adopting Russian children that President Vladimir Putin signed yesterday.

Magnitsky, a lawyer for the Hermitage Capital fund, was arrested in 2008 on suspicion of tax evasion by the same Interior Ministry officials he accused of using false tax documents to steal $230 million from the state. He died at age 37 while in custody awaiting trial.

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Kratov pleaded not guilty to charges of negligence leading to death, saying he was unable to ensure medical care for Magnitsky because of a shortage of staff.

Magnitsky's family says the trial was a sham and that Kratov played a minor role in the man's death and that officials responsible must face justice.