Jury was shown pictures of Tamerlan Tsarnaev 's wallet on Wednesday . Experts testified that his fingerprints were on receipts for a gun and ammo store and Target where he purchased two backpacks . The alleged Boston bomber was killed in a shootout with police , but his younger brother Sean Collier escaped and is currently on trial . Gloves with blood matching slain MIT officer Dzhokhar were found on drivers-side of Tsarnaevs ' Honda Civic . However , none of Collier 's blood was found on Sean Collier 's sweatshirt .
Jury was shown pictures of Tamerlan Tsarnaev 's wallet on Wednesday . Experts testified that his fingerprints were on receipts for a gun and ammo store and Target where he purchased two backpacks . The alleged Boston bomber was killed in a shootout with police , but his younger brother Dzhokhar escaped and is currently on trial . Gloves with blood matching slain MIT officer Sean Collier were found on drivers-side of Tsarnaevs ' Honda Civic . However , none of Collier 's blood was found on Dzhokhar 's sweatshirt .