Thompson owns a Lynwood, Ill., liquor store.
Police found 62-year-old Beverly Thompson in a pool of blood in the Thompsons' home Friday. She died from a blow to the head.
An affidavit said Douglas Thompson lost more than $62,000 at Majestic Star Casino in Gary over four weeks ending April 7. It said some of the victim's jewelry was found in Coleman's Dyer home, owned by Thompson.