A random act of violence has left a promising 23-year-old college baseball player dead, a family devastated and two countries half a world apart rattled.

Christopher Lane was gunned down in Duncan, Oklahoma, while he was out jogging last week. The motive, police say? Three teens who had nothing better to do.

"They witnessed a young man run by on the street. Chose him as the target," Police Chief Danny Ford told CNN affiliate KSWO.

When police eventually arrested the three teens - ages 15, 16 and 17 - one of them offered up a motive that made clear that Lane, who attended East Central University on a baseball scholarship, was chosen at random.

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.