Kalnui said that Nunes has since returned to the area to search for any sign of her husband.
The Argentine Foreign Ministry said Carmen Lopardo, 80, an Italian native who had lived in Argentina for 60 years, died in Barcelona.
Nunes-Tucker told NBC News that they were having drinks at a patio when her husband said he was going to the bathroom. They shot and killed five people early Friday who were wearing fake bomb belts as they attacked the seaside resort of Cambrils with a speeding auto.
"Next thing, I know there's screaming, yelling", Nunes-Tucker told NBC.
On Friday she was called to identify his body, though some news outlets still claim Tucker is among the missing.
CBS News explained that in the photo, a man was kneeling next to Jared, appearing to be administering aid, which gave the family hope.
People from 34 different countries were injured or killed, emergency services said. "He's hurt, but it's not fatal".
"He was really a neat guy".
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The 43-year-old man from Lafayette, Calif., had been walking with his wife, Heidi Nunes-Tucker, when a decision to use the restroom changed everything. "Amidst bad sadness, the people of Barcelona came out in droves to help us", said Luke. He had "a magnetic personality and people loved him", his dad said.
Dan said he and Jared were extremely close, not only as father and son but as business partners and friends. I've known Jared Tucker since high school.
When asked how he was feeling, Dan Tucker paused, struggling to answer. "It's just hard to understand how anything like that could happen", he said. "What are the chances?" he wondered.
Friends and family posted about their heartbreak and tributes to Tucker on social media.
There were songs and prayers Friday night at El Sobrante Christian for sixth-grade teacher Heidi Nunes Tucker.
The U.S. State Department did confirm that one U.S. citizen "suffered minor injuries", but the person was not named.
The police force for Spain's Catalonia region says the five suspects shot and killed in the resort town of Cambrils were carrying bomb belts, which were detonated by the force's bomb squad.