Scott Dietz, 60, died of a heart attack. He was a retired police canine handler who worked in the 16th and 20th police districts. He later worked at O’Hare Airport with his trusted bomb-sniffing dog Bart investigating unattended luggage and stalled vehicles. He was a dog handler at O’Hare until his retirement nearly two years ago. They were often called on to sweep Air Force One and VIP motorcades for explosives for U.S. presidents and vice presidents, and kings and queens. Other police K9 officers paid tribute to him by bringing their partners to Cooney’s Funeral Home. He and Bart, a yellow Labrador retriever, were inseparable and even retired together. So it was fitting that Bart stayed next to his master’s body at the funeral parlor. Mr. Dietz is also survived by his children, Christopher and Colleen.