Doesn't matter. The Catholic Church recognizes most marriages as legitimate (generally, if you consider yourself husband and wife then you are unless proven otherwise, ie marriage ruled invalid and annulled), so even someone with a civil marriage would still need an annulment to marry someone else in the Church.
Where did he and Teresa get married? Was it by a priest? That would never happen in my diocese.
My brother married a Catholic and then converted. She divorced him after 21 years and 4 children. She started talking annulment, but he was going to fight it for the kids sake. She dropped it. He is now remarried to another Catholic, but they did not get married in the Catholic Church. So they are married, but not in the eyes of the Catloic Church since he never had his first marriage annulled.