Fife School District Deputy Superintendent Jeff Short says 43-year-old Ryan Callis died Wednesday evening.
Bus footage shows 13-year-old Jeremy Wuitschick rushing down the aisle to the unconscious driver and grabbing the wheel Monday morning as other students yell: "Call 911!"
Wuitschick turned off the ignition and guided the bus safely onto the curb. Students started CPR on Callis until help arrived.
Paramedics who rushed to Surprise Lake Middle School in Milton, Wash., said the Tacoma man suffered a heart attack.
Short says the 12 students on the bus and other drivers were offered counseling Thursday in light of the death.