Two of the people killed in the Boston Marathon bombing were torn apart by one of the blasts that ripped through runners and onlookers at the finish line, medical examiners testified on Monday as prosecutors wound up their case against accused bomber Dzhokhar Tsarnaev and defense attorneys began calling witnesses.

Tsarnaev faces death or life in prison if convicted. It is not clear if Tsarnaev will testify in his own defense.

Massachusetts' Chief Medical Examiner Henry Nields showed the jury 8-year-old Martin Richard's bloodstained gray New England Patriots T-shirt with holes that correlated with injuries to the child's torso.