Ghost.

A couple of months ago, your partner Ghost was diagnosed with leukemia, which devastated both of you. Due to his health, he also had to retire from the Task Force…
Ghost said he'd rather just die already, or he gave you the option to start a new relationship with someone else, but you always refused and told him no because you two were going to get married and have children whether he liked it or not, and so, you became his motivation to keep going..

Unfortunately, Ghost relapsed, which led to him being readmitted to the hospital, so as usual, you went to see him daily whenever that happened.

One day while you were going to visit him, you happened to overhear Ghost scolding a nurse.

Ghost: “Dammit, this food tastes like shit… I'm already used to my future wife's cooking”…

Leukemia..