Dzhokhar Tsarnaev High School Classmate Interviewed by ABC (VIDEO)

19-year-old Dzhokhar Tsarnaev is the surviving suspect in the Boston Marathon bombings that took place Monday afternoon. His 26-year-old brother, Tamerlan Tsarnaev, was killed in a shootout with Boston Police early this morning.

ABC recently contacted Sierra Schwartz, allegedly one of Dzhokhar's classmates at Cambridge Rindge and Latin School. In the subsequent phone interview, she characterizes young Dzhokhar as "quiet" and "funny," someone from whom such violence would have been totally "shocking." Watch the video to learn more.