Article Photos: Pittsburgh Zoo: Boy's mauling death is mom's fault 1/3

In this Nov. 9, 2012 photo, Jason Derkosh holds his wife, Elizabeth, at the funeral of their 2-year-old son, Maddox, at Saint Bernard Church in Mount Lebanon, Pa. The Pittsburgh Zoo & PPG Aquarium says Elizabeth Derkosh, the mother of 2-year-old  Maddox Derkosh, who was fatally mauled when he fell into a wild African dogs exhibit, is to blame for her son's death and shouldn't be allowed to sue. The zoo's attorneys made that argument in a response filed Monday Sept. 9, 2013 to the wrongful-death lawsuit brought by Jason and Elizabeth Derkosh.  Maddox Derkosh died Nov. 4, 2012 after falling over a 4-foot-tall wooden railing into the exhibit when his mother lifted him up to get a better look.(AP Photo/Tribune Review, Justin Merriman)  PITTSBURGH OUT