YEKATERINBURG, July 1 (RAPSI) - Tarkhan Kartoyev, one of the individuals convicted of bombing the Nevsky Express train in 2009, died late on Saturday night in a prison hospital in Yekaterinburg, the Federal Penitentiary Service told RIA Novosti on Monday.

"There is no evidence of death by violence," Yelena Tishchenko, a spokesperson for the service's Sverdlovsk regional department, said. "The preliminary diagnosis is acute heart failure. After a 30-minute resuscitation procedure, his heartbeat failed to resume."

Forensic experts will establish the precise cause of his death. A report on his death has been sent to the investigators. This is routine practice when a convicted person or suspect dies, Tishchenko said.

The high-speed Moscow-St. Petersburg train crashed after a bomb exploded on the border between the Tver and Novgorod regions in northwest Russia on November 28, 2009. The blast killed 28 people and injured over 90.

The Tver Region Court found Zelimkhan Aushev and nine individuals all with the surname Kartoyev guilty of involvement in an illegal armed group and illegal arms sales, and handed down sentences ranging from two years to life imprisonment on May 22, 2012.

The Tver Region Court also fined the defendants 8 million rubles ($257,000) to go to the victims of the bombing, although it dismissed some of the lawsuits filed by the victims, advising them to seek compensation through a civil procedure.

In addition, the court acquitted several other individuals in the case who had been charged with banditry, ruling that they had not committed any offense.

Another explosion aboard the Nevsky Express train had taken place two years previously, in August 2007. Around 60 people were injured, but there were no fatalities. Salambek Dzakhiyev and Maksharip Khidriyev, who were detained in connection with the 2007 case, were later acquitted of terrorism, but sentenced to 10 and 14 years, respectively, for illicit trafficking in explosives.