I found this website for death certificates, but I have not used them. https://sacatuacta.com/acta-de-defuncion-estado-tamaulipas-mexico/ As to obituaries, I have no idea as to how to find them unless you hire someone locally to check the newspapers or find out the name of the newspapwers/s for the area and see if they have them online or if you can do an inquiry via email.

sacatuacta.com

Acta de Defunción Estado de Tamaulipas - México - Saca tu Acta

Ingresa y solicita tu Acta de Defunción Certificada de Estado de tamaulipas, Impresas en Papel Original del Registro Civil. Con validez para presentarlas en Todos tus Trámites.