LA JOYA, Texas (AP) — The Texas trooper who fired on a fleeing pickup truck from a helicopter near the U.S.-Mexico border, killing two illegal immigrants hiding in the bed, has returned to work but in a different role, the state Department of Public Safety said Thursday.

The announcement came less than an hour after the American Civil Liberties Union and local civil rights organizations gathered near the site of the Oct. 25 shooting to demand an investigation by an independent body outside the agency. Currently, the Texas Rangers, an elite force within DPS, is leading the investigation.