BOSTON - Lawyers for Boston Marathon bombing suspect Dzhokhar Tsarnaev say the FBI asked his older brother and fellow suspect to be an informant.
The lawyers asked a judge in court filings Friday to order prosecutors to turn over any evidence on brother Tamerlan Tsarnaev. They say that could help persuade a jury to spare Dzhokhar Tsarnaev the death penalty if it supports the defense theory Tamerlan was the "main instigator."
The defense says it wants records of all FBI contact with Tamerlan based on information from the Tsarnaev family and others that the FBI "questioned Tamerlan about his Internet searches, and asked him to be an informant, reporting on the Chechen and Muslim community."
Twin explosions at last year's marathon killed three people. Tamerlan Tsarnaev later died in a shootout with police.