Boston ( CNN ) Jurors in the Boston Marathon bombings trial were shown a key piece of evidence Tuesday : Dzhokhar Tsarnaev 's writings on the inside of the boat he used as a hideout . Prosecutors presented photos of three panels of the boat that had messages written in pencil . Boston police Officer Todd Brown , a bomb squad member who cleared the boat of explosives , was on the witness stand to talk about the writings . Tsarnaev is charged with 30 counts related to the April 15 , 2013 , bombings that killed three people and wounded more than 260 others . A fourth person , an MIT police officer , was ambushed and killed in his patrol car three days after the bombings as Tsarnaev and his brother , Tamerlan , allegedly ran from police . Tamerlan Tsarnaev , 26 , was killed after a gunbattle with police . On Tuesday , Brown identified Dzhokhar Tsarnaev in court as the man he saw come out of the boat and get taken into custody . In the writings on the panels , some of Tsarnaev 's words were struck out by bullet holes . `` I 'm jealous of my brother who ha ( bullet hole ) ceived the reward of jannutul Firdaus ( inshallah ) before me , '' one of the writings said , referring to the word for paradise . `` I do not mourn because his soul is very much alive . God has a plan for each person . Mine was to hide in this boat and shed some light on our actions . '' Tsarnaev 's connections : Who 's who . Tsarnaev 's defense has argued that he indeed participated in the bombings , but that he was influenced by his radicalized brother . In his writings on the boat , Tsarnaev asked Allah to allow him to reach the highest levels of heaven . `` The US Government is killing our innocent civilians but most of you already know that . As a ( bullet hole ) I ca n't stand to see such evil go unpunished . We Muslims are one body , you hurt one you hurt us all . Well at least that 's how muhhammad ( bullet hole ) wanted it to be ( for ) ever , '' Tsarnaev wrote in the boat . Also Tuesday , prosecutors called on FBI agent Steve Kimball to discuss two Twitter accounts linked to Tsarnaev . One , @ J_tsar , contained 1,100 tweets and was the more mainstream of the two . `` I shall die young , '' @ J_tsar tweeted on April 12 , 2012 . And four days later , on the day of the 2012 Boston Marathon , a tweet from the account read , `` They will spend their money & they will regret it & they will be defeated . '' Timeline of the bombings , manhunt and aftermath . Prosecutors argued that these tweets indicate an attack on the Boston Marathon was on his mind a year before the bombings . Tsarnaev attorney Miriam Conrad , who opted not to cross-examine the bombing survivors who testified during the first week of the trial , got Kimball to acknowledge that some of his information about the tweets came from other agents and that he did n't check them out for himself . Conrad also established that some of the tweets appeared to be rap lyrics . CNN 's Ann O'Neill reported from Boston , and Mariano Castillo wrote in Atlanta .
A police officer testifies about the writings Dzhokhar Tsarnaev scrawled on a boat . The boat was Tsarnaev 's final hideout before his arrest .