I'm so very sorry ! Such a darn shame. But I would like to say this, and put it up here, so as not to be lost.
I have heard alot of this in my travels, to many forums.
It is NOT just cats, on the collared forum it was a dog, of a good buddy. German shepard, Actually jumped through the glass to get at the lizard. 
Beautiful female collared dead. The dog had to be taken to the vet to have glass removed, from him. Owner to say the least was horrified !
I think if you notice, your dog or cat paying the lizards a bit TO MUCH attention, while your there, then don't let them have access to the lizards when your not there.
Better yet keep the lizards in an area away from cats and dogs whenever ya can. Or a room with a door that can be SHUT when you are not there. I also have cats and dogs, thats why this was on my mind !
Very sorry, for you and the kids, feel better soon. And hope soon you can get a new beardie friend 
Eve

