Matteo Alacran was not born; he was harvested from a cow. His DNA came from El Patron because he is his clone.
Celia introduces Matteo to El Patron for the first time and they get along great, like father like son, even though Matteo isn't exactly his son. El Patron loves Matteo and Matteo loves El Patron.
arsenic Matteo finds out his reason on existence; for him to give his organs to El Patron when he is in need of them. Celia however already knew his plan so she put arsenic in his meals so his heart won't be healthy for a transplant. Due to this El Patron dies.