Kim Kardashian's kitten, Mercy, diesRelated: Kanye West, Katy Perry, Kim Kardashian, Lady Gaga, Khloe Kardashian, La La Anthony
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Kim Kardashian is in mourning.
Her adorable kitten Mercy -- a gift from boyfriend Kanye West -- has died, Us Weekly confirms.
"Kim is so sad [about losing Mercy]," a source close to the reality star tells Us.
E! News reports that the fluffy feline passed away from a "cancer-like virus often associated with breeding," and that Kardashian, 32, had given the cat to sister Khloe's assistant, Sydney, after discovering she was allergic. (At the time, Sydney was grieving the loss of her own pet cat, who had passed away after 12 years.)
According to E!, Mercy's new owner decided to have her euthanized after learning that her kitten was terminally ill, and that "even aggressive treatment" wouldn't help her situation.
"Mercy was a gentle and loving kitten and we are all going to miss her so much," Kim wrote in a statement on her blog about the sad news. After explaining how she went to multiple allergists to try to find a cure for her cat allergy, and the details of the kitty's illness, she added: "Thanks to Sydney for making Mercy's short life one filled with love."
Kardashian first showed off the newest Kardashian on Instagram in early September. She named her pet after one of boyfriend West's summer hits, "Mercy."
In honor of Mercy's short life, click through for pics of Kim paying homage to her late furry friend ...
This article originally appeared on Usmagazine.com: Kim Kardashian's Kitten Mercy Dies
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