Not by himself he won't, but him and another pro-lifer(If Roberts is pro-life) will lead to Roe's death.
No, no, no! We don't need a pro-lifer, we need somebody who actually read the Constitution :-). I mean, Justice Kennedy is pro-life, so what? He voted to uphold Roe in Casey. OTOH, Justice White was pro-choice, so what? He dissented in Roe and later always voted against upholding it.