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In this Aug. 5, 2019, file photo Greg Zanis of Aurora prepares crosses to place at a makeshift memorial for victims of a mass shooting at a shopping complex in El Paso, Texas. (AP Photo / John Locher, File)

The death of Greg Zanis, announced by his daughter, Susie Zanis, and confirmed by the mayor of the community where Zanis lived, was expected after a recent announcement that he had been diagnosed with bladder cancer and did not have long to live.

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In this Aug. 5, 2019, file photo Greg Zanis prepares crosses to place at a makeshift memorial for victims of a mass shooting at a shopping complex in El Paso, Texas. (AP Photo / John Locher, File)

Greg Zanis has set up crosses after the school shootings at Columbine, Sandy Hook and Parkland. He also placed crosses after the Las Vegas music festival shooting and the Orlando nightclub shooting.