Derek Ross Fierro, Chicago public school teacher accused of killing pet, called dog stupid

25-year-old Derek Ross Fierro, a Chicago public school teacher who reportedly admitted to killing his own dog, once called his dead pet dumb... and now the evidence has been deleted! 

Friday morning, around 3:43 a.m., Fierro made a frantic 911 call after he beat his dog to death is his East Lakeview neighborhood apartment on the 500 block of West Roscoe Street, said police.

According to various news reports, the Eugene Field Elementary school teacher became enraged when his dog, Queso, ate "every piece of paper" in his apartment and soiled himself.

Citing police dispatch reports, Fierro put the dead dog's body in the truck of his car, called the cops, and waited for authorities at a nearby Starbucks. 

Late Friday evening, Derek Ross Fierro's Facebook profile, listed under profile number 7936041, was permanently deleted.

At first glance, the page seemed pretty harmless... but after reviewing its contents from a prosecutorial standpoint, we understand why Fierro's profile was removed from the internet.

Among other things, the page contained several adorable photos of Fierro's dog. One pic showed the yellow lab/chow mix sleeping on a pillow on the backseat of a car.

Another photo of the pooch included a caption where Fierro referred to the dog as stupid, because the pet, who was given the name Doc by the Chicago Canine Rescue Foundation and later renamed Queso by his new owner, seldom responded to his new name.

We can't recall the teacher's exact words, but they were something like, "My dog has the most crookedest ears and he is too dumb to know his own name." 

On the surface, Fierro's comments about his dog's lack of intelligence may seem innocuous, but in light of what happened, they may have been a sign that Fierro was losing his patience with an animal that obviously needed a lot of love.