Tucson

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Southern California defensive back Chris Hawkins (4) upends Arizona quarterback Khalil Tate (14) during the first half of an NCAA college football game, Saturday, Oct. 15, 2016, in Tucson, Ariz. (AP Photo/Rick Scuteri)

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FILE - This April 26, 2015 file photo provided by the Pima County Sheriff's Department shows, David Dwayne Watson, in Tucson, Ariz. The criminal case against the former Tucson Fire Department Capt., Watson, who built his career while he was a murder suspect in the cold case killings of his ex-wife, her mother and her mother's friend, begins with opening statements in Tucson on Wednesday, Oct. 5, 2016. (Pima County Sheriff's Department via AP, File)

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In this Tuesday, Oct. 4, 2016, photo in Tucson, Ariz., an employee of the Tucson Botanical Gardens plants marigolds for the upcoming exhibit “Frida Kahlo: Art, Garden, Life” is shown under construction. The exhibit, which broke attendance records in New York City during its six-month run there last year, will debut in Tucson on Oct. 10, 2016. (AP Photo/Astrid Galvan)

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In this March 19, 2016, photo, Republican presidential candidate Donald Trump speaks during a campaign rally in Tucson, Ariz. (AP Photo/Ross D. Franklin)

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Mario Valencia, 36, is rammed by a police cruiser just outside Tucson, Arizona, Feb. 16, 2015. Mr. Valencia is charged with robbing a convenience store in Tucson, breaking into a church, invading a home, stealing a car, and stealing a rifle from Wal-Mart. (Image: YouTube, Arizona Daily Star)

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Flowers, teddy bears and inspirational posters line a room at the Arizona History Museum in Tucson in this Wednesday, Jan. 7, 2015 photo. The items were left at the scene of the Jan. 8, 2011, shooting in Tucson that left six dead and 13 wounded. Former Rep. Gabby Giffords was the target and suffered a gunshot wound to the head from which she is still recovering. So many items were left at the shooting site and at University Medical Center, where victims were treated, that a nonprofit group stored them in a warehouse for several years. They have been on display at an exhibit at the museum since October 2014, but will be removed Jan. 9. (Associated Press)

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Martha McSally, candidate for Congressional District 2, makes a speech to supporters during a Republican election night party at the Sheraton Tucson Hotel and Suites, Tuesday, Nov. 4, 2014, in Tucson, Ariz. (AP Photo/Arizona Daily Star, Mamta Popat)

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Tucson, Arizona, ranks as the top city in a list of cities with the happiest retirees on grandparents.com.

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Tourists walk through the temporary structure running under the east tower of Mission San Xavier del Bac south of Tucson, Ariz., to ward off pieces that could fall from the structure, Thursday, April 16, 2014, Tucson, Ariz. (AP Photo/ Arizona Daily Star, Kelly Presnell)

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Sergio Celis, right, watches as his wife Becky discusses the case of their missing daughter, Isabel, in their Tucson, Ariz., home on Monday, April 14, 2014. (AP Photo/ Arizona Daily Star, Ron Medvescek)

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Pamela Phillips looks on in Pima County Superior Court Tuesday, April 8, 2014, in Tucson, Ariz. Phillips, a once-prominent socialite, was found guilty Tuesday of first-degree murder and conspiracy to commit murder in the 1996 Tucson car bomb killing of her ex-husband after spending years abroad living a lavish lifestyle across Europe. (AP Photo/Arizona Daily Star, Ron Medvescek, Pool)

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Pamela Phillips looks on in Pima County Superior Court Tuesday, April 8, 2014, in Tucson, Ariz. Phillips, a once-prominent socialite, was found guilty Tuesday of first-degree murder and conspiracy to commit murder in the 1996 Tucson car bomb killing of her ex-husband after spending years abroad living a lavish lifestyle across Europe. (AP Photo/Arizona Daily Star, Ron Medvescek, Pool)