No the plaque psoriasis cannot kill you.
The plaque psoriasis is uncomfortable, embarrassing, itchy etc but the plaque psoriasis cannot kill you and does not mean you'll have a lower life expectancy than other people without plaque psoriasis.
Even when you have plaque psoriasis you should still live a good long life as long as you're healthy in other ways.
Some people experience plaque psoriasis flare ups when they are stressed out.
Stress is one of the triggers of plaque psoriasis so if you do have plaque psoriasis it's best to avoid stress when possible.
Stress can kill you though because it affects your heart, blood pressure and can lead to heart attacks, strokes and heart disease.
But with plaque psoriasis it's not a deadly health issue.