The husband of a heroic fourth grade teacher who was killed protecting her students during a massacre at a Texas elementary school has died of an apparent heart attack.

A GoFundMe page set up by Debra Austin, who said she was the cousin of teacher Irma Garcia, said that Irma's husband Joe "has tragically passed away this morning (5/26/2022) as a result of a medical emergency."

"I truly believe Joe died of a broken heart and losing the love of his life," she added.

John Martinez, who identified himself as Garcia's nephew, also tweeted: "EXTREMELY heartbreaking and come with deep sorrow to say that my Tia (aunt) Irma's husband Joe Garcia has passed away due to grief."

Ernie Zuniga, a news anchor for local station KABB FOX San Antonio, tweeted that Garcia had died from a heart attack.

The couple, who were married for 24 years, according to the website of the Robb Elementary school, leave behind four children.

Both Irma Garcia and her co-teacher Eva Mireles, who had connected classrooms, died in the mass shooting.

The shooter, 18-year-old Salvador Ramos, was inside the building for about 40 minutes before police entered and fatally shot him.

Guns are now the leading cause of death for American children

Firearms have surpassed motor vehicle crashes as the leading cause of death among American youngsters, with official data showing a strong rise in gun-related homicides such as the killing of 19 children in a Texas school rampage.

Overall, 4,368 children and adolescents up to the age of 19 died from firearms in 2020, a rate of 5.4 per 100,000 a dashboard by the Centers for Disease Control and Prevention (CDC) showed.

Homicides made up nearly two-thirds of the gun deaths.

By comparison, there were 4,036 deaths linked to motor vehicles, the previous leading cause of death among this age group. 

The gap has been narrowing as road safety measures have improved over the decades, while gun related deaths have risen. 

The trend lines crossed in 2020, the latest year for which data is available -- a finding identified in a letter to the New England Journal of Medicine (NEJM) last week.

The letter's authors noted the new data was consistent with other evidence that gun violence rose during the Covid-19 pandemic, for reasons that aren't fully clear, but "it cannot be assumed that (it) will later revert to pre-pandemic levels."

The newly updated CDC dashboard shows that nearly 30 percent of the deaths were suicides, just over three percent were unintentional, and two percent were of undetermined intent.

- 'Deadly consequences' -
A small number were categorized as "legal intervention" referring to killings by law enforcement.

The deaths disproportionately impacted Black children and adolescents, who were more than four times as likely to die as white children -- for whom motor vehicles still posed a greater threat.

The second most impacted group by guns were American Indians, followed by white Hispanics.

Males meanwhile were six times likelier to die by a gun than females.

By region, the gun-related death rate was highest in the capital Washington, followed by the state of Louisiana, then Alaska.

The figures served to underscore that while mass shootings such as the one in Uvalde provoke horror, they make up only a small fraction of overall childhood gun deaths.

"Since the 1960s, continuous efforts have been directed toward preventing deaths from motor vehicle crashes," wrote the authors of another recent letter to the NEJM, contrasting the situation with that of firearms, where regulations have been loosened.

While vehicle safety has been spearheaded by the National Highway Traffic Safety Administration, there is no equivalent agency to regulate gun safety, and historically very little government research funding was assigned to the area because of Republican opposition.

Holden Thorp, editor-in-chief of leading journal Science published an editorial Thursday calling for more research into the public health impacts of gun ownership to advance policy change.

"Scientists should not sit on the sidelines and watch others fight this out," he wrote.

"More research into the public health impacts of gun ownership will provide further evidence of its deadly consequences," he continued, arguing that severe mental illness, often blamed for mass shootings, was prevalent at similar levels in other countries that do not have regular mass shootings.