My heart is hurting

My younger sister found my older sisters cat dead, what hurts the most is that it was shot to death, we don't know who did it. Her cat was found dead too, by my dad but we don't have the heart to tell her. She's sad as it is that my older sisters cat is deceased, and my younger sister is somewhat autistic, she wouldn't fully understand why, this is totally wrong. They don't know how much harm they cause, poor babies didn't deserve to die. They are truly fucking assholes. 😢😢😢