The death of Mr. Martínez and his daughter has given an urgent and poignant face to a major driver of migration from Central America and elsewhere: economic duress.
Much attention in recent years has been given to the rampant violence that has compelled so many Salvadorans and residents of neighboring Guatemala and Honduras to head north.
But perhaps a bigger impetus, officials and residents here say, has been economics, especially poverty and the lack of good jobs.
The Martínez family made it as far as the northern Mexican border city of Matamoros last weekend, where, according to relatives, they hoped to cross into the United States and apply for asylum.
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Mr. Martínez and Ms. Ávalos, however, worked relatively close to their home, family members said — she in a Chinese fast-food restaurant at a middle-class mall, and he at various branches of the pizza chain Papa John’s.
But the couple, even though they were sharing household expenses with Ms. Ramírez and her partner, were having a hard time on their salaries of about $300 a month. Last fall, they started talking about migrating to the United States.