WOBURN (AP) — Middlesex County prosecutors say they’re building a murder case against the suspect in the Boston Marathon bombings for the death of an MIT police officer.

Authorities have said Sean Collier was ambushed and killed by Tamerlan and Dzhokhar Tsarnaev while Collier was in his cruiser the night of April 18. Tamerlan died hours later following a shootout with police in Watertown. Dzhokhar was captured the next day hiding in a boat in a backyard.

Spokeswoman Stephanie Guyotte said Middlesex County prosecutors have been gathering evidence in the slaying of the 27-year-old officer and expect to file charges against Tsarnaev. She said they have no specific timeline for filing charges.

Tsarnaev faces federal charges in the April 15 bombings that killed three people. The charges could carry the death penalty.

Copyright 2013 The Associated Press.


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