Boston marathon bombing suspect Dzhokhar Tsarnaev suffered multiple and severe gunshot injuries before his capture in April , newly released court documents show . The most serious of the injuries was a gunshot wound that appeared to enter through the left inside of his mouth and exit through the lower left side of his face , said Stephen Ray Odom , a trauma surgeon who treated Tsarnaev at Beth Israel Deaconess Medical Center . `` This was a high-powered injury that has resulted in skull-base fracture , with injuries to the middle ear , the skull base , ... his ... vertebrae ... as well as injury to the pharynx , ( and ) the mouth . '' Odom said in testimony given April 22 , three days after Tsarnaev was arrested following the bombing . His testimony , unsealed Monday , does not say whether the 20-year-old college student inflicted the wound on himself or suffered it during his showdown with police April 19 . Authorities cornered him in a boat in the backyard of a Watertown , Massachusetts , home after an intense manhunt . The final hours that paralyzed Boston . Another document unsealed Monday said a special team of federal agents were able to speak with the seriously wounded Tsarnaev for about two days without any Miranda warnings being given , under a `` public safety exception . '' The document shows he was read his Miranda rights in the hospital on April 22 . Tsarnaev is charged with killing four people -- three spectators who died in the April 15 bombings and a Massachusetts Institute of Technology police officer ambushed in his cruiser a few days later . At least 264 people were wounded in the double bombings , which took place near the marathon finish line . Controversial Rolling Stone cover of Tsarnaev called a 'slap ' to Boston . He is awaiting trial , after having pleaded not guilty to 30 federal charges . If convicted , he could receive up to life in prison or the death penalty . His older brother , Tamerlan , is also accused of the attacks . He was killed when Tsarnaev ran over him as police were trying to handcuff him , authorities said . CNN learned in the weeks following the bombing that Tsarnaev admitted to the acts , and said he and his brother acted alone . Sources say he has since stopped talking with the government . Tsarnaev pleads not guilty .
Tsarnaev had multiple gunshot wounds , court records say . One wound started inside his mouth and exited his face . Tsarnaev was read his Miranda rights on April 22 . He faces additional federal charges tied to the April 15 shooting .