Maria Carrillo student Keith Lutter, 15, remained at Children's Hospital Oakland on Tuesday, more than a week after he was found seriously injured on the ground at Montgomery High School.
Lutter, who suffered head injuries in what police said was likely a fall, has been in an induced coma as part of his care.
Police still are investigating what happened that Nov. 23 afternoon. He was found unconscious and bleeding, lying alongside an outer gym wall.
"Nothing has developed. We're still not able to talk to him because of his condition," said Santa Rosa Sgt. Dave Linscomb on Tuesday. "More than anything, things seem consistent with a fall."
Police have said they've learned the teen has been on Montgomery's roof at least once in the past and has been known to participate in a sport known as parkour.
Parkour involves scaling, leaping and performing other acrobatics using everyday obstacles such as railings, walls and sometimes roofs as a course.
If Lutter was scaling a wall or jumping from roof to roof at Montgomery when he was hurt, he's not alone in getting injured during such an activity.
Detectives have interviewed a teen who broke a leg while roof jumping at Montgomery in recent months. The two injured boys know each other, Linscomb said.
Montgomery High officials did not return a phone call seeking comment Tuesday.
Santa Rosa fire Capt. Steve Lowe said he's been to three schools for calls regarding teens injured while roof jumping. One was at Montgomery.