Mariana Santiago Lerco

December 21, 1992 – May 23, 2026 | Chantilly, Virginia

She was 33, and a Sagittarius — which, if you knew Mariana, explains quite a lot.

Mariana Santiago Lerco, 33, of Chantilly, Virginia, passed away on May 23, 2026 — and she would like you to know that she left a very detailed checklist of everything that still needs to get done, and it is already on the calendar.

Born in São Bernardo do Campo, São Paulo, Brazil, Mariana arrived in the world on a day her parents will never forget. Her father and mother went to see her in the nursery, and there she was — that beautiful face, already making her presence known, sobbing with the full conviction of someone who had important things to say and intended to be heard. Her mother felt it immediately: a love so fierce and complete that she knew, in that moment, she would do anything in the world to keep those tears from falling. That little face changed everything. It showed her, for the first time, what it truly means to be a mother.

There is a particular kind of fire that was Mariana’s alone, and her family saw it early. At her fifth birthday party, as the moment arrived to blow out the candles, a friend darted in and blew them out first. Mariana was furious — genuinely, magnificently furious. It was, by all accounts, hilarious. And it told you everything you needed to know: Mariana showed up fully, she felt things deeply, and she was not about to let someone else take her moment.

Mariana arrived in the United States as an au pair, determined to master the role despite having arrived with more enthusiasm than experience. It was during this chapter of her life that she met her husband Sven on OKCupid, which just goes to show that the algorithm occasionally gets something right.

She studied environmental engineering in college, which explained a great deal about her deeply personal conviction that nothing — nothing — should ever go to waste. Not a drop of dish soap, not a square of paper towel, and certainly not yesterday’s coffee, which she drank with the same serene satisfaction most people reserve for a fresh cup.

Mariana worked at Food Chain ID, where she brought her characteristic precision to GMO sample data entry. She was a woman who trusted the science, except when it came to cooking, where she trusted her instincts exclusively and with spectacular results. Her kitchen experiments were legendary. They did not always produce food that was good, exactly, but they reliably produced food that was memorable, and the laughter that followed was always worth it. She would never name a recipe. She would simply cook it, watch your face, and light up like sunshine whatever your reaction.

And that smile — if you knew Mariana, you knew the smile. It would start small, and as the joke landed, it would take over the whole room. Years of patient effort went into teaching her the phrase “that’s what she said,” and every time she finally got it, that laugh filled the house like music. Well-intentioned music. Unlike her singing, which was delivered with tremendous heart and significant room for improvement.

For twelve years, Mariana fought cancer. She fought it the same way she did everything else — completely, stubbornly, and without ever letting it have the last word. Through surgeries, radiation, and chemotherapy, she refused to be defined by it and refused to be slowed down by it. She lifted weights. She danced. She hiked trails and explored new cities and planned adventures, corrected everyone’s Portuguese, and loved her family with everything she had. Cancer was something that happened alongside her life, never instead of it. She did not let it win a single day.

She loved her Corinthians soccer team with a loyalty that transcended logic or standings. She lifted weights five mornings a week. She danced like she meant it. She did her nails with an artist’s dedication, maintaining a collection of polishes that was, by any reasonable measure, a full inventory. She lost her phone constantly, which was especially impressive given that it was usually out of battery.

Mariana ate every meal as though it deserved her full attention — which it did. Her husband would gently observe that she seemed to be naming each bite individually before consuming it. She did not deny this. She would pair something savory with something sweet without hesitation or apology, and she was always right about it.

She traveled to Sweden, Portugal, Bolivia, and across Brazil and the United States, because she wanted to see the world, and she saw as much of it as she could. She was warmly welcomed everywhere she went — a natural traveler who made friends as easily as she found new trails to hike. She loved being out in nature, with the sun on her face and the trail ahead of her, and she was just as happy exploring a new neighborhood by bike as she was summiting a hillside with a view. Wherever she went, she made an excellent companion — curious, enthusiastic, and never too proud to stop and take it all in.

She watched all of Grey’s Anatomy. She tried very hard to watch movies with her husband all the way to the end. She rarely made it. She considered this a personal challenge and approached each new film with genuine optimism.

Mariana spoke English beautifully — better than her husband, in fact, a man of proud Scandinavian roots who had no such excuse — a point she raised frequently and correctly. In return, she corrected everyone’s Portuguese with the patience of a woman who had accepted that proper language was a gift she was called to give, whether you wanted it or not. Her husband responded, on occasion, with perverse Portuguese phrases that made her close her eyes, take a slow breath, and explain — again — with great dignity, that no one actually talks like that.

She is survived by her husband, Sven Rajala; her stepson, Matias Rajala; her faithful Bichon-Poo, Dexter, who will miss her most of all; her mother, Elizabeth Santiago; her father, Robson Lerco; her sisters Debora Santiago Candida, Clara Santiago Lerco, and Laura Santiago Lerco, from oldest to youngest, in the order Mariana would absolutely insist upon; her beloved nephew Nicolas Santiago Prado, son of Laura, her beloved niece Isadora Santiago de Melo, daughter of Debora, and Svea Leonhardt daughter of sister in-law Linnea Rajala-Leonhardt; her maternal grandparents, Laudelina Brasil dos Santos Lima and Geraldo Luiz Lima Santiago; her uncles and aunts, Carlos Henrique Santiago and Elaine Santiago, Luciano Lima Santiago and Mendes Pedrosa, Ricardo Lima Santiago and Luciana Santiago, and Lindomar Lima Santiago and Rosana Santiago; and her cousins Ione Santiago, Henrique Santiago, Giovana Santiago, Caren Santiago, Andrey Santiago, Sabrina Santiago, Renan Santiago, Barbara Santiago, and Maria Eduarda Santiago.

She leaves behind a wall calendar full of reminders, a phone somewhere in the house at some unknown charge level, an unfinished chore list, and a family that is immeasurably better for having been loved and corrected and fed and laughed at by her.

The world was brighter for her being in it. We’ll do our best to keep it that way.

How do you solve a problem like Mariana?

You don’t. You just love her.