A Massachusetts prosecutor has scheduled a news conference to discuss her office's investigation into the April 2013 shootout that left one of the Boston Marathon bombers dead and nearly killed a police officer.

Middlesex District Attorney Marian Ryan is scheduled to make a statement Tuesday regarding the investigation.

The armed confrontation in suburban Watertown on April 19, 2013 ended with the death of bomber Tamerlan Tsarnaev (TAM'-ehr-luhn tsahr-NEYE'-ehv) and left MBTA Officer Richard Donohue clinging to life after getting shot. Donohue only returned to work last month.

The shootout was four days after two pressure-cooker bombs exploded at the marathon finish line, killing three people and injuring more than 260.

Tamerlan Tsarnaev died after getting run over by his brother, Dzhokhar (joh-HAHR'), who was sentenced to death last month.