Stallworth admitted to police that he snapped the neck of his dog, a pit bull named Face, and threw the dog's body in the basement. That's the dog found dead in the second-floor window sill, police say.

The building was a recently vacant apartment house near Union Boulevard and Martin Luther King Drive.

Stray Rescue says X-rays taken as part of the necropsy report show that the dog in the window had "traumatic trauma to the larynx. Stray Rescue veterinary staff believes that this was caused by the abusers positioning the dog on the window sill and slamming the window down upon him repeatedly, crushing his larynx and killing him."

Rescuers also found chains and electrical cords used to restrain and strangle the animals inside the apartment. The building's front doors were boarded up with "No Trespassing, No Loitering" signs. Stray Rescue said graffiti was scrawled on the interior walls of the building.

Stray Rescue initially offered a $5,000 reward for information that leads to a criminal conviction in the case, but that reward was later increased to $10,000 after more donors came forward. Anyone with additional information about the abuse case can call Stray Rescue at (314) 771-6121.