Eric Finley of University of Medical Center in Lubbock says a 13-year-old girl also might be en route in critical condition.
Police say the shooting happened at 8:11 Tuesday at Berrendo Middle School in Roswell, and a suspect is in custody.
Officials at Eastern New Mexico Regional Medical say two students were brought there after the shooting. It's unclear if either of those victims was then transferred to Lubbock, or if the student being treated in Lubbock is a third victim.
Finley says information from nurses treating the boy indicates he was the target of the shooter. LIVE COVERAGE