FORT WORTH, Texas — The husband of one of the fourth-grade teachers killed in the Uvalde school shooting Tuesday has died, according to multiple news reports. Irma Garcia, who was a 23-year veteran teacher at Robb Elementary School, was killed after an 18-year-old gunman entered the campus, barricaded himself in a fourth-grade classroom and fired dozens of shots — killing 19 students, Garcia and another teacher. Garcia’s husband, Joe, reportedly suffered a fatal heart attack shortly after his wife’s death, according to Ernie Zuniga, of KABB FOX San Antonio. Zuniga reported that the pair had be…