I don't think I have access to Buenos Aires newspaper obituaries though I do have full access to Ancestry.com and Newspapers.com. I found the following on Ancestry which may be relevant. I can see the document in full but the handwriting/foreign words are hard for me to read. If you can be more specific about what you're trying to find, I may be able to help more. Or, maybe you or someone reading this would be interested in starting a profile for David so we can collaboratively research further.
Hope this helps!
Mexico, Select Church Records, 1537-1966
David Vázquez
Spouse: María Concepción Ríos
Child: María Eugenia Vázquez Ríos