Dylan Klebold, the depressed senior at Columbine High School, had Eric Harris. Washington, D.C., Beltway sniper Lee Boyd Malvo had John Allen Muhammad. And just last week at the Boston Marathon bombings, suspect Dzhokhar Tsarnaev had his 26-year-old brother, Tamerlan Tsarnaev.
Klebold, Malvo and Dzhokhar Tsarnaev all might be seen as more passive teenagers who were attached to more assertive mentors whose actions had deadly consequences, according to mental health experts.
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