That was the last I heard too, but I haven't seen anything about it in years.
Initial media and public response was sympathetic, and the sympathy wore off once people basically got sick of seeing their faces plastered all over tv. They became the face of the frivolous, wealthy middle class and people started to resent them for it. It soon stopped being a question of "who took maddie?" and became one of "why did these clueless middle class dopes leave all of their children alone whilst they ate an extravagant dinner?" which is when they became suspects. But like I say, it's been a while since I've heard anything either way