A state Superior Court grand jury has been hearing sworn testimony over at least several weeks from State Police troopers and others close to the investigation of a police recruit’s death during a training exercise in September, according to three people with direct knowledge of the secret court proceedings.

The grand jury appears to be an escalation in the months-long investigation by special prosecutor David Meier. The veteran defense attorney and former prosecutor was tapped by state officials to lead an independent probe into the death of 25-year-old Enrique Delgado-Garcia, who suffered serious injuries in a boxing ring during an academy training exercise in New Braintree. He died a day later.

The circumstances of Delgado-Garcia’s death and the nature of the grand jury proceeding

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