Who is Mutt Philmore Thomas from Corregidora and what is their importance?

Mutt Philmore Thomas is Ursa's first husband. He doesn't like her singing at Happy's because he believes the men look at her inappropriately. When Mutt demands that she quit her job, Ursa refuses. Angry, he pushes her down some steps and causes her to lose their child. By the end of the story.... they get back together.