The teacher (Irma Garcia) was killed protecting her students. Her husband died two days later

Joe Garcia had just placed flowers Thursday morning at the memorial site of his high school

When he returned, he sat down at a kitchen table surrounded by family and suddenly collapsed

The Archdiocese of San Antonio and the Rushing-Estes-Knowles Mortuary also confirmed Joe Garcia's death

One of the couple's nephews tweeted that Joe Garcia died after suffering a heart attack at home

Irma Garcia and co-teacher Eva Mireles were killed along with 19 children at the school

Martinez said he was told that Joe Garcia “went to go deliver flowers for Irma at the memorial for her."

Doctors described it as a potential example of broken heart syndrome