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Robert and Karen Bonta, married 50 years last summer, explored all seven continents as they charged into their 70s.
So Amy Bonta Ferin didn't worry about her parents each winter when they left their chilly Iowa home for the saguaro-dotted desert hills near Phoenix. Her mother, Ferin said, who also kept a bag packed to travel to events involving her three children and 10 grandchildren, lit up a room with her hopeful, smiling face.  
"One of the hardest things to see was her in a casket," Ferin said. "She didn't have a smile on her face." 
Robert and Karen Bonta, 72 and 71 respectively, were killed after an SUV struck them March 13 in the desert community of Fountain Hills, Arizona.
A Ford Explorer driven by 27-year-old Alex Bradshaw hopped a curb and hit them as they stood on a sidewalk. Canadians Patti Lou and Ronald Doornbos, were also struck by the SUV as they walked toward the corner in a marked crosswalk. Patti Lou, 60, died immediately; Ronald died June 12.

The four deaths highlight a growing danger for America’s most vulnerable road users: Death by SUV.