With heavy hearts, we announce that Santiago Casillas went to be with our Lord on Thursday, October 16, 2025, at 75 years old. Santiago was born on September 15, 1950, to his parents Franciso and Demetria Casias, in San Antonio, Texas. A few of Santiago's favorite hobbies included dove hunting, fishing, traveling, and a variety of outdoors hobbies, such as planting trees, and bird watching. He also enjoyed watching old western movies, the Andy Griffin show, and listening to Tejano music.

He is survived by his wife of 34 years of marriage Rosa G. Casillas, 3 daughters Rosa Gallegos (Samuel Olmeda), Gloria Hinjosa (Arthuro Perez), and Cecilia Vega; 5 grandsons, 4 granddaughters, 1 great granddaughter, and 1 great grandson; Siblings, Juan Jose Casias, Domingo Casias (Petra Casias), Alfonso Casias, Lupe Douglas, Victoria Cortez, Antonia Danalina, Frances Medina (Johnny Medina), Cornilla Lopez, and Mary Mulkey. Also, numerous other family and friends. He was preceded in death by his parents Fancisco and Demetria Casias, sisters Mary Mulkey, Antonia Danalina, Lupe Douglas, Matilde Olivares (Jose Olivares), and Samuel Cortez; In-laws: Panz Casias, Catherina Casias, Leonard Douglas, and Henry Mulkey

A viewing will be held on Friday, October 24, 2025, at Southside Funeral Home from 5:00 p.m. to 9:00 p.m. with a rosary at 7:00 p.m.