How did Sergei Magnitsky die?

Sergei Leonidovich Magnitsky (Russian: Сергeй Леонидович Магнитский, pronounced [sʲɪrˈɡʲej lʲɪɐˈnʲidəvʲɪtɕ mɐɡˈnʲitskʲɪj]; Ukrainian: Сергій Леонідович Магнітський; 8 April 1972 – 16 November 2009) was a Russian tax advisor responsible for exposing corruption and misconduct by Russian government officials while representing client Hermitage Capital Management.[1] His arrest in 2008 and subsequent death after eleven months in police custody generated international attention and triggered both official and unofficial inquiries into allegations of fraud, theft and human rights violations in Russia. His posthumous trial was the first in the Russian Federation.

Magnitsky alleged there had been large-scale theft from the Russian state, sanctioned and carried out by Russian officials. He was arrested and eventually died in prison seven days before the expiration of the one-year term during which he could be legally held without trial. (What a coincidence)

https://en.wikipedia.org/wiki/Sergei_Magnitsky

Was it a head injury?

Was it a heart failure?

Was it because of an asymptomatic disease?

Was it because of an abdominal rupture?

Was it because of pancreatitis?

You be the judge, and remember...