premise: Tamerlan Tsarnaev has been in a shootout.
hypothesis: Tamerlan Tsarnaev . Shortly after the Federal Bureau of Investigation declared them suspects in the bombings and released images of them , the Tsarnaev brothers killed an MIT policeman , carjacked an SUV , and engaged in a shootout with the police in the Boston suburb of Watertown . According to the federal indictment , during the shootout Tsarnaev was captured but died , partly as a result of his brother driving over him , and an MBTA police officer was critically injured in the course of Dzhokhar 's escape in the SUV ( the latter by what may have been friendly fire ) .