Matthew Truax was 16 and a junior at the school.
The Snohomish County Medical Examiner said a condition called "hypertrophic cardiomyopathy" caused his death. It is described by medical experts as a condition in which the heart muscle becomes thick without any obvious signs. The thickening prevents it from pumping effectively and can cause sudden cardiac arrest.
Meadowdale staff called 911 just before 10 a.m. Friday, according to school and fire officials.
Teachers began CPR, and firefighters took over. The boy was unresponsive when crews arrived. He was taken to Swedish/Edmonds hospital.
More Local News Headlines
Everett teens were shot because one wore blue, police say 2:11 p.m. State attorneys are investigating Eyman's use of initiative money Panel gives green light to unfair labor practices case against Roe Painter Elizabeth Webber leaves a legacy of faith, courage and art 3:07 p.m. Family recognized for operating same small farm for 127 years People who live along lakes can make a difference to protect them 2 papal parades, more passes available after ticket outcry 3:05 p.m. Opportunities
Our new comment system is not supported in IE 7. Please upgrade your browser here.