Death Records Now

My daughters father left before she was born he had a death in the family and had to return to his state in mexico which was hildalgo he was last seen in 6-21-98 by me his daughter is now 8 she wants to know about him his name is segio hernandez
and we meet in Yakima washington certain people belive he may have passed from this earth and if so I would like to know how to find any type of records from mexico i know he has family there still and that he heard that he had achild but we moved from the Yakima area after the first year of our dauters life any type help in finding answers to our daughtersqustions would be helpful thank you

My dad left me when i was 3…its hard