A cat that gained worldwide attention for his unusual look has died.The 12-year-old cat named Ugly Bat Boy was a fixture at Exeter Veterinary Hospital, where he would spend most of his time on a warm computer. He was bald over most of his body except for flowing fur on its chest.Click to view photos of the cat.Ugly Bat Boy was discovered to have a heart condition last year, and veterinarian Dr. Stephen Bassett said he seemed to be responding to treatment."With this type of heart disease, cats can just suddenly throw an arrhythmia and pass, and that’s what he did in his sleep on Saturday night," Bassett said.Bassett said Uggs, as the cat was known, continued to get visitors interested in his appearance, even though it had started to change recently."People would come to see him because he was hairless, and interestingly, when he was on the heart medication, he was growing more hair," Bassett said. "He had more hair on his head and his body than he had before."The cat was born in a litter of four and had a sister who looked like him. That sister died at a few weeks old.Workers at the veterinary hospital said the cat had a nice disposition and inner beauty. They got so many questions about the cat that they posted fliers explaining that he was normal, just ugly."He was a good cat. He was," Bassett said. "He just became more personable as he got older. He would sit in your lap. He followed the sun around the clinic. He always found the area where it was warmest, and we had towels because we know where the sun would come in in the morning and afternoon, so he would sit in specific spots to stay warm."The veterinary hospital has posted a sign letting visitors know that Ugly Bat Boy died."People are very upset," Bassett said. "We see people here repetitively. They know us, we know them and they know him, and they’re saddened by it. He was an entity that touched a lot of people."