We lost our Senior cat and one cat went nuts! HELP!

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I'm still- learning- English!
Purred: Sun Oct 14, '12 2:49pm PST 
This is a multi-cat household, we had 6, but with the passing of our senior male, Fuzz, we're down to 5. All of them get along great and we've only ever had aggression issues out of Nephi, my female Ragdoll. She's always been a bit cray-cray, it was why she was in the shelter I adopted her from to begin with. She'll be loving and sweet one moment and gnawing on your arm the next. And I mean gnawing hard.
She's gotten better over the years and we pretty much know how to read her expressions to tell when the little switch in her head goes from sweetie to crazy. She only ever antagonized Totchi, my Wegie and even that was never violent or biting hard enough to break the skin, she would just tackle him and um...mount him.
We always assumed it was just her showing her dominance and she only ever did it to Totchi, none of the other cats.

So after we lost Fuzz, about a week later, Raidou, male tuxedo, started beating the living heck out of Nephi. He goes beyond tackling her to chasing her, hitting her, biting her, it's a knock-down cat fight like you hear in the alley at night. Neph has NEVER antagonized him, and he's never antagonized anyone else! He was raised from a kitten around all the other cats and while he's always been prone to aggressive play (the day we brought him home as a kitten he went straight up to my 15 lb boy cat Serph and boxed him on the nose. Those two are now best friends lol)
Anyway he's never been nasty before like, this, and it's just getting worse. Fuzz has been gone about 2 months now and Raidou is just UNBEARABLE. He beats Nephi to the point that when she sees him she hisses and runs away, and pretty much every time he sees her he chases her down till she hides.
Twice now she's had her eyelid scratched to the point she won't open her eye, and today is the third time and I just am at my wits end with Raidou! I don't know what to do to keep him from attacking her or why he's picking on HER and only her when they never had any problems with each other before.

The only time he doesn't attack her is when they're on my bed together, right now as I'm typing this they're each lying on either side of me sleeping just fine. But if either one of the touches the floor, it'll be a brawl again.

Nephi is declawed (not my choice, she came that way) and can't even fight back that well. I'm so tired of seeing my poor girl beat to heck and not be able to do anything about it. I'm also afraid something is wrong with Raidou to cause him to act this way, but I just don't know what!
Like I said all this happened after we lost Fuzz, but Fuzz and Raidou didnt seem especially close so I can't figure out what this could all mean.

Alexander,- Dreamboat- #110

I am really a- lap dog in- disguise.
Purred: Sun Oct 14, '12 4:45pm PST 
I would have her health checked out. My Alex seemed to go after Natasha. We thought that it was an aggression problem and my vet gave both of them Prozac...Alex was always a sweetie but Natasha would cry if she saw him. He just wanted to play. This problem went on for some time.
Then, she was diagnosed with an iris melanoma which placed a lot of pressure on her eye. It made her feel awful and she wanted no part of Alex. She felt better for some time when the eye was removed. Then, almost a year later, she passed away. Poor Alex just wanted to play with her.
If you heard her, you would think that he was hurting her. .....Now, Alex has a good friend in Juliette. Both of them groom each other and sleep together. He loves playing ball with Juliette.
It must hard for you. It drove me crazy to hear poor Natasha cry when she saw Alex. We had to keep her separate from him. Our new kitten, Juliette, would cry if she didn't get to be with Alex. They truly like each other....I hope that you find the reason for this problem soon. It took us over one and half years to find the real cause.....


I'm still- learning- English!
Purred: Sun Oct 14, '12 10:41pm PST 
Alexander- I'm so sorry about your girl! I've lost a couple to cancer and it never gets easier frown In this case though I've seen Raidou attack her and he is hurting her, he's always been an aggressive player but this isn't play, he rips chunks of her fur out with his mouth and always has his claws out and ears back. The big bump on her poor little eye is from him slamming her into the ground with his body weight, at least that's my guess, because he hits her so hard she can't get up and our house is all hardwood and slate so when she goes down it's a really hard surface to hit frown I plan to take her to the vet this week to get her eye looked at anyway (I think it's just a bruise but I'm afraid she may have a cut under her eyelid I cant see) so I'll make sure to get a full check up on her as well though!