A Chicago man who quickly accelerated in a sport utility vehicle with a cable around his neck decapitated himself after a domestic dispute in Yorktown, authorities said on Tuesday.Sheriff Danny Diggs said a deputy responding to a call of a domestic disturbance on Tuesday was taking a statement from the man’s ex-wife when another deputy driving by noticed an SUV pulling a utility trailer that was on fire. Authorities say the man started the fire.A firefighter noticed a cable around the man’s neck that was attached to a tree. When deputies tried to get the man to exit the SUV, he accelerated and was pulled from the vehicle and decapitated, they say.Diggs said he arrived at a grisly scene, adding the cable was of the type that could be used to hoist an automobile engine.”Nobody has ever heard of anything like this,” Diggs said. “It’s a really bizarre incident.”Diggs said the man and his ex-wife had quarreled over the man’s living arrangements.”He was looking to relocate from Chicago to this area, and he wanted her to do more than she was willing to do,” Diggs said.The sheriff said he was unsure how long the couple had been divorced. He said they have two school-age children who were not at home at the time.Diggs said officials aren’t releasing the man’s name because they don’t publicly identify suicide victims. However, officials said the man was 46 and from Chicago.