 Soon after his arrival in Walford Jack begins an on-off relationship with Ronnie Mitchell (Samantha Womack), but he betrays her by having sex with her sister Roxy (Rita Simons), and getting her pregnant.Jack also has a brief fling with Sam Mitchell (Danniella Westbrook), resulting in another baby.He goes on to reunite with Ronnie, however their child, James dies of sudden infant death syndrome.