When Harper returned to town (after having escaped from prison), Jack foiled his plan to kill Steve during his second marriage to Kayla by pushing him off the roof of the bell tower...killing him. His own marriage plans were interrupted when Jennifer stepped in for her high-school chum Katerina von Leuschner (now known as Dr. Carly Manning) and married Lawrence Alamain. When she didn't come back, Jack went looking for her, and ended up in a cell next to Katerina's brother, François, who he later discovered was the Brady's adoptive son, Frankie Brady. The two managed to escape with the help of Lawrence's father, Leopold Alamain (who died in the attempt).