Pete Collins was the abusive ex-husband of Sadie Stone.
Introduced in the Season Three episode First to Have A Second Chance, he shows up in town demanding to see his ex-wife as he wants a share in whatever she's earning from her career. When she tries to stand up for herself he punches her, leaving her with a black eye.
She soon tells Rayna Jaymes who says that she'll use some of her funds to pay him off so that he will leave her alone and warns him that if he attempts to come near Sadie again he will have her to deal with.
Sadie goes on national television to speak about the abuse which angers Pete. She also purchases a gun and is granted a restraining order before Pete shows up in a parking garage to confront her. She ends up shooting him dead and after being questioned by the police the charges against her are dropped.