Between whatever happened to me with the Power Stone and the Kree blood infusion....I don't know if I can die or not. I mean, I don't age. I know that. Physically, I've been 29 for 25 years.
And then there's the healing factor. It's hard to damage me, especially since I got control of my powers. I've taken a lot of hard hits that should have probably killed me and I don't even have a scratch. I bleed, I go down, but I'm healed up within a few days.
I'm sure something could kill me. Probably decapitation, maybe a massive explosion that literally tears me apart. But it would have to be one hell of an explosion to do that considering I've absorbed the energy of an entire star before.