It was between her stuff, just a piece of paper saying Leo, he open it.
Dear Leo,
If you are reading is because I am already gone and you are probably mad at me because I didn't make it. Because I left your side. My spot in the world, the place I belong. My favorite place in the world.
I am sure you are wondering why I wrote this, the principal reason of this is that since the helmet incident I can't know when I am going to die and I don't want to leave you without you knowing all this.
You've been always my best friend, the first and the biggest, the person I trust the most, and I don't know if before you get to read this letter I'll be bold enough to tell you that I love you, with all of my heart and soul. That since the first moment we become lab partners and even now I've been madly in love with you.
I maybe don't have a clue of how I'm going to die, neither when or where but there is one thing I'm certain of, when you read this, and I know you will, You'll understand what used to happen in my mind every time I was around, 'cause you are My person Leo, you've always been. And that the reason I am going to ask for this, move on, I need you to move on and don't just sunk and do nothing, I need you to stay with the team, you need them and they need you. Keep an eye on Skye, because she is a magnet trouble; make sure Ward and May be trait after every wound and don't let them go into the field in bad shape; help Coulson with anything he needs, it's not good that a man of his age overcharge too much. Keep them safe Fitz, they are family now. And please never forget this, you are a hero Leo Fitz, you are my hero.
Yours always, Simmons.
A tear rolled down his cheek, now he would never get to answer, to tell her he love her too, she was gone and he was broken.