The Run of His Life: The People vs. O. J. Simpson by Jeffrey Toobin:
In January 1994, when Nicole moved into the Bundy condominium, her relationship with O.J. oscillated between reconciliation and a final breach, and the financial tensions between them escalated. The first point of conflict revolved around a man named Kato Kaelin. Although the Simpson affair made the name Kato synonymous with houseguest, his original relationship to Nicole was the more familiar one of tenant to landlord. Kaelin had rented her guest house at Gretna Green for five hundred dollars a month, a figure he could reduce somewhat by baby-sitting for her children. (During this period Sydney and Justin grew so fond of Kato that they named their pet Akita after him.) When Nicole moved to Bundy, she and Kaelin planned to continue the deal, with Kato paying to stay in a small guest suite wedged between the garage and the kitchen. Shortly before the move, however, O.J. told Kaelin that although he had had no objections to his living in a separate guest house at Gretna Green, he didn’t want him living under the same roof as his ex-wife. Simpson’s solution was to give Kaelin a rent-free guest house at his home on Rockingham. O.J.’s offer thus simultaneously removed a potential rival for Nicole’s affections and took money out of his ex-wife’s pocket. It also led ultimately to Kaelin’s prominent place in the history of freeloading.