Susan runs over to confront Karl and asks if he spent the night. Susan Mayer walks out of her house one morning to find her ex-husband, Karl Mayer picking up the paper at her frenemy Edie Britt's house. Julie ends their fight by telling Karl she likes having Mike around and that he is really nice so he better not ruin it. This leads to an argument between Karl and Susan. Karl doesn't want Julie to be spending a lot of time around an ex-con. She tells him no and she rushes to Mike's house to announce her love for him. The next day, Karl goes to Susan's house to ask for a second chance. Susan is furious and when she sings onstage at Julie's party she nearly has a breakdown and yells at Karl which leads him to walk out of the party. Edie then gets into the conversation and reminds Karl that at the Christmas party two years before that, Karl and Edie spent the night together after they kissed under the mistletoe. Karl tells Susan he deserves credit for not cheating on her for twelve years before. Susan and Karl get into an argument about his infidelity. While Edie is singing at the party, Susan kisses Mike which makes Karl jealous. Edie tells Karl happy birthday until Susan awkwardly says it is Julie's birthday. Karl brings Edie Britt as his date to Julie's party. Susan's boyfriend Mike Delfino thinks Susan is still in love with Karl since she can't say she loves Mike back. Karl and Brandi breakup so his ex-wife, Susan invites Karl to Julie's birthday party. Susan apologizes to them which Karl thinks is ridiculous. Later on, Susan calls Karl and tells him and Brandi to come over later. Susan is angry and throws the can and it lands by Mike Delfino's foot and he says 'Do you want me to pick up the can?'. Karl tells Susan she is ridiculous and he leaves. Karl goes to pick up the can but Susan wants Brandi to do it. Karl tells Susan to do it herself since she is closer to the can. Susan is upset and tells Karl to tell Brandi to pick it up. Brandi throws her soda can but misses the trash can. Karl and his girlfriend Brandi go to pick up Julie for the weekend and Karl and Susan fight over a dinner party she has to go to which means he needs to watch Julie longer which cuts into his plans with Brandi. Karl later started dating his secretary, Brandi. Susan kept the house and got primary custody of Julie.

Susan confronted him about his affair and kicked him out.

One day, Susan found lipstick on Karl's suit. Numerous times throughout the marriage, Karl cheated on Susan with different women, including the cable woman, a masseuse, Susan's frienemy Edie Britt, and most recently, his secretary, Brandi. The Mayer family then moved to Wisteria Lane in 1991 when Julie was 2 years old. Karl and Susan had a daughter named Julie Mayer. Their wedding was ruined by rain and all the guests, and Susan, Karl, and the minister all gathered under a gazebo. He met Susan Bremmer one day and they eventually married. He went to college and became a divorce attorney.

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