What causes people to die in young adulthood?

[Jason]

After a pregnant New York teacher collapses at school and dies, community mourns

Courtney Fannon, a special education teacher in Kendall, New York died Friday, March 8, hours after she was found unresponsive at school.

www.usatoday.com

The article doesn't say why she died. What might it have been? What health problems are a plague to young adults? What causes death aside from war, AIDS, murder, car accidents etc.?

 

[Demon_skeith]

Bad luck? Long line of bad genetics in the family catching up to her? Body couldn't endure child birth? So many reasons and so many more to come sadly.