TERROR

Prosecutor scheduled to discuss investigation into 2013 shootout with Boston Marathon bombers

  • Middlesex District Attorney Marian Ryan points to a map during a news conference in Woburn, Mass., Tuesday, June 2, 2015, to the spot where a gun battle with the Boston Marathon bombers took place in Watertown, Mass., in April 2013. A report on the incident said it is "high likely"  transit police officer Richard Donohue was critically injured by friendly fire during the gun battle. Standing, at center, is Watertown Police Chief Edward Deveau. (AP Photo/Steven Senne)

    Middlesex District Attorney Marian Ryan points to a map during a news conference in Woburn, Mass., Tuesday, June 2, 2015, to the spot where a gun battle with the Boston Marathon bombers took place in Watertown, Mass., in April 2013. A report on the incident said it is "high likely" transit police officer Richard Donohue was critically injured by friendly fire during the gun battle. Standing, at center, is Watertown Police Chief Edward Deveau. (AP Photo/Steven Senne)  (The Associated Press)

  • Middlesex District Attorney Marian Ryan speaks during a news conference Tuesday, June 2, 2015, in Woburn, Mass. A report on a gun battle with the Boston Marathon bombers that took place in Watertown, Mass., in April 2013, said it is "high likely"  transit police officer Richard Donohue was critically injured by friendly fire during the gun battle. (AP Photo/Steven Senne)

    Middlesex District Attorney Marian Ryan speaks during a news conference Tuesday, June 2, 2015, in Woburn, Mass. A report on a gun battle with the Boston Marathon bombers that took place in Watertown, Mass., in April 2013, said it is "high likely" transit police officer Richard Donohue was critically injured by friendly fire during the gun battle. (AP Photo/Steven Senne)  (The Associated Press)

  • Middlesex District Attorney Marian Ryan speaks during a news conference Tuesday, June 2, 2015, in Woburn, Mass. A report on a gun battle with the Boston Marathon bombers that took place in Watertown, Mass., in April 2013, said it is "high likely"  transit police officer Richard Donohue was critically injured by friendly fire during the gun battle. Standing, at center, is Watertown Police Chief Edward Deveau. (AP Photo/Steven Senne)

    Middlesex District Attorney Marian Ryan speaks during a news conference Tuesday, June 2, 2015, in Woburn, Mass. A report on a gun battle with the Boston Marathon bombers that took place in Watertown, Mass., in April 2013, said it is "high likely" transit police officer Richard Donohue was critically injured by friendly fire during the gun battle. Standing, at center, is Watertown Police Chief Edward Deveau. (AP Photo/Steven Senne)  (The Associated Press)

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.