Gray's death on April 19 set off weeks of largely peaceful protests in Baltimore punctuated by a day of rioting and arson after his funeral on April 27, when rioters threw rocks at police and set buildings and cars on fire.
The grand jury's findings, including one count of second-degree depraved heart murder against officer Caesar Goodson Jr., were largely in line with the charges that Mosby announced early this month. The officers will be arraigned on July 2.
"These past two weeks, my team has been presenting evidence to a grand jury that just today returned indictments against all six officers," Mosby told reporters. She took no questions.
The death of Gray, 25, followed a string of police-involved deaths of unarmed black men in Ferguson, Missouri, New York City and North Charleston, South Carolina, which provoked waves of protests across the United States.