Suffolk County District Attorney Daniel F. Conley today assigned a senior prosecutor to the ongoing investigation of the use of force by Boston Police during an Oct. 22 arrest at Roxbury Community College.

Conley tapped First Assistant District Attorney Josh Wall to represent the Suffolk DA’s office in the probe. Wall, a Suffolk prosecutor for more than 15 years who oversees all Superior Court prosecutions in Suffolk County, is a widely-respected attorney who oversaw reforms in the use of eyewitness evidence by Boston Police and Suffolk prosecutors.

“It’s important for everyone involved that there be independent eyes reviewing what occurred here,” Conley said. “I spoke with Commissioner Davis, who has already initiated what he promises will be a complete and thorough internal investigation. Commissioner Davis has further pledged ongoing cooperation with my office, including providing us with all of the investigative materials so we can make an impartial determination concerning possible criminal conduct.”

The subject of the arrest, a 16-year-old juvenile who is not being identified because of his age, was arraigned Monday in the Boston Juvenile Court. He was held on $500 cash bail on that case and his existing bail on open cases for assault and battery with a dangerous weapon and trespassing was revoked.