Conversation so far:
Did Chris have children?
In 2001 Chris married Villanueva and they had two children, a boy and a girl.
what happened in 1998?
John Garza introduced him to Venessa Villanueva, and after getting to know each other they became a couple in 1998.
Who is John Garza?
CANNOTANSWER.
why was 1995 important?
She was pronounced dead within the hour.
Who was found dead in 1995?
Selena.

Question: How did Selena die?
Self-contained rewrite: How did Selena die?