Two days after teacher Irma Garcia was shot dead alongside 19 of her students her grieving husband has died.

Ms Garcia’s family was already reeling from her death in the Texas school shooting that targeted her fourth grade classroom when, a mere two days after the attack, her husband collapsed and died at home from a heart attack, a family member said.

Joe Garcia, 50, dropped off flowers at his wife’s memorial on Thursday morning in Uvalde, Texas, and returned home, where he “pretty much just fell over” and died, his nephew John Martinez told The New York Times.

The couple had been married for 24 years and had four children together – including a son in the Marine Corps.

Mr Martinez told The Detroit Free Press that the family was struggling to grasp that while the couple’s oldest son trained for combat, it was his mother who was shot to death.

“Stuff like this should not be happening in schools,” he told the newspaper.

The Archdiocese of San Antonio and the Rushing-Estes-Knowles Mortuary confirmed Joe Garcia’s death to The Associated Press. AP was unable to independently reach members of the Garcia family on Thursday.

The motive for the massacre — the nation’s deadliest school shooting since the 2012 attack in Newtown, Connecticut — remained under investigation, with authorities saying the 18-year-old gunman had no known criminal or mental health history.

The rampage rocked a country already weary from gun violence and shattered the community of Uvalde, a largely Latino town of some 16,000 people about 75 miles from the Mexican border.

According to a letter written by Ms Garcia and posted online, her family loved having barbecues. The 48-year-old also enjoyed listening to music and travelling to Concan, a community along the Frio River about 25 miles north of Uvalde.

The couple’s oldest child, Cristian, is a Marine. The couple’s other son, Jose, attends Texas State University. Their eldest daughter, Lyliana, is a high school sophomore, while her younger sister is in the seventh grade.

The school year, scheduled to end on Thursday, was Ms Garcia’s 23rd year of teaching — all of it at Robb Elementary School. She was previously named the school’s teacher of the year and was a 2019 recipient of the Trinity Prize for Excellence in Education from Trinity University.

For five years, Ms Garcia co-taught with Eva Mireles, who also was killed.

The suspect, Salvador Ramos, was inside the classroom for more than an hour before he was killed in a shootout with law enforcement, authorities said.

“Mrs Irma Garcia was my mentor when I began teaching,” her colleague Allison McCullough wrote when Ms Garcia was named teacher of the year.

“The wealth of knowledge and patience that she showed me was life changing.”