No, Sergio does not die. He survives the entire series and is one of the few original main characters alive at the end of the show.
Yes, Sergio Marquina, also known as "The Professor," dies in the final episodes of Money Heist. does sergio die in money heist
In the series finale:
The death of Sergio Marquina has significant emotional resonance, as it's a pivotal moment in the series. The remaining characters are left to grapple with the consequences of his sacrifice, and the story concludes with a bittersweet tone. No, Sergio does not die