Massachusetts prosecutor says she intends to try Tsarnaev for killing of MIT police officer

A state prosecutor says she intends to try Boston Marathon bomber Dzhokhar Tsarnaev (joh-HAHR' tsahr-NEYE'-ehv) in the death of a Massachusetts of Institute of Technology police officer even though Tsarnaev is already on death row.

The 21-year-old Tsarnaev was sentenced to death last month after being convicted of federal charges in the April 2013 bombing that killed three people and injured more than 260 others. Some of those charges related to the shooting of officer Sean Collier by Tsarnaev and his older brother Tamerlan days after the bombings.

Middlesex District Attorney Marian Ryan tells The Boston Globe ( a state trial is still appropriate. She noted Tsarnaev's federal conviction and sentence will be appealed.

The prosecutor did not immediately return a message from The Associated Press. Defense attorney John Salsberg declined comment.