How do I stop a domain from appearing on SEO?

[bear4]

I have two domains:

I no longer use the first one, I just use the newer, second one.

How do I make it so that my first domain no longer comes up on Google searches? It appears before my second domain does on Google and I do not want that.

[Queso]

Hello bear!

If the domain is no longer attached to a site, it should depart along with the site when the results are updated by Google's system. How long has it been since the site was taken down?

[bear4]

I switched over to the new domain in early October 2016. If you enter the old domain's URL, it redirects to the new one.

[Queso]

That would be a bit unusual. What are the domains in question? We'll look them up here as well.