The boy plunged from the roof of the 700 building, a three-story building which houses junior high school students just before 4 p.m.
He was pronounced dead at the scene by the Los Angeles County Fire Department at 4:15 p.m.
Authorities say the boy died from head injuries sustained in the fall.
Police and school administration officials would not confirm if the boy committed suicide or fell by accident, but said foul play is not suspected.
“It looks like it may have been a suicide,” according to Lt. Brian Fitch of the Crescenta Valley Sheriff’s Station.
“He jumped off during a softball game.”
It has not been officially confirmed that the young man was a student at the school.
But there are reports the boy was a high school senior.
No other information about the boy was immediately available.
All campus activities have been cancelled for the weekend, but classes will resume on Monday, according to La Canada Unified School District Superintendent Wendy Sinnette.
“We will provide professional support and we will also provide the social and emotional support and just community support that’s necessary for us to begin the healing process from what is a completely saddening and horrifying event.”
Crisis counselors are available to any student or family that needs it and to check the school’s website for more information.