While not outright confessing to the bombings Dzhokhar Tsarnaev said his older brother Tamerlan was the real bad guy and led investgators to believe the two were motivated by religious beliefs and the American wars in Iraq and Afghanistan.
The surviving brother will be charged with using a weapon of mass destruction and could face the death penalty.
Compiled reports also indicate the brothers may have learned about bomb making on the Internet.
Tsarnaev is still struggling to speak but communicated through head nodding and writing during a hospital room court hearing.
Download the entire transcript (PDF) of the bedside hearing by clicking here.
Tsarnaev's next court date is set for May.