This depends on your flavor of utilitarianism. Some are indifferent to trading between two equally good lives. I regard killing someone who currently has preferences and replacing them with a new person to be lost QALYs.
Depending on your flavor of utilitarianism that could be lost utility, but it’s strange to call it lost QALYs. A QALY is just a length of time in years weighted by how good it is. Two people leading happy lives for 1000 years is the same number of QALYs as twenty people leading happy lives for 100. (Death does bring suffering to both the person dying and the people they leave behind, thus decreasing QALYs, but this is a relatively small fraction of the suffering someone has over the course of their life.)
This depends on your flavor of utilitarianism. Some are indifferent to trading between two equally good lives. I regard killing someone who currently has preferences and replacing them with a new person to be lost QALYs.
Depending on your flavor of utilitarianism that could be lost utility, but it’s strange to call it lost QALYs. A QALY is just a length of time in years weighted by how good it is. Two people leading happy lives for 1000 years is the same number of QALYs as twenty people leading happy lives for 100. (Death does bring suffering to both the person dying and the people they leave behind, thus decreasing QALYs, but this is a relatively small fraction of the suffering someone has over the course of their life.)