I recently had an old sick cat pass away at home at almost 14 years old. My other cat and her knew eachother for 13 1/2 years but we're never considered "close" friends. Now that she is gone, my other cat is urinating and pooping all over the house and mainly in front of me to witness. He knows he's doing something wrong because he stares at me then makes a mad dash around the house. This is a cat who has rarely ever missed the litter box.Could the other cat's death be affecting his behavior like this?