What happens if you're selected as a juror for a pro-death penalty stance but refuse it

[Gnarly Like Whoa]

in deliberations? In other words, if I was selected for a jury because the selectors thought I believed in the death penalty, but when deliberation time came I refused to vote for it.
PS: Totally just a hypothetical question. I always thought this scenario would be interesting.

I was just wondering whether they can replace you or something.