Sudden Death of Corn Snake

[Seymour13]

My Corn Snake died very suddenly. I raised him from a baby, he was 9 years old, and never had any health issues. He fed about 4 days ago, was still active and alert. Two nights ago he started spitting blood from the nose and mouth. He was dead within a few hours. I've searched all over and can't find any possible reason for this. Anyone ever heard of this or know what possibly could have gone wrong? Could it have been a bad mouse??