i came home last night to find my 41/2 month old cat abby dead on my front step. she was an energetic and loving cat. i am uncertain what happened to her. she began to purr constantly around 6 weeks old. 3 days prior to her death she had one incident of very light spotting of blood from her rectum and or vagina. also last night i found a cream color crust on my bed spread that had a small amount of blood. any ideas of what may have killed her? might i also mention that there was a minute amount of blood at the death scene and on her. the vet found no broken bones or signs of poison. kids in my neighborhood saw her playing cheerfully in the yard about 3 hours before i found her dead. there were no signs of distress. she was also an unusually large cat. bigger than her mother and 2x as big as the rest of the litter at 4 months.