SIERRA VISTA, Ariz. (KGUN9-TV) - A grieving mother continues to look for answers in her son's murder.
27-year-old Kyle Riley was killed three years ago at a home on Tucson's southeast side.
His mother, Mary, says he had recently moved there when he was shot. It is still unclear if the home's owner witnessed the shooting but he did call 9-1-1.
Mary questions why his murder has not been solved.
Mary planned to go door-to-door throughout the neighborhood with reward posters about her son's case.
Anyone with any information can call 9-1-1 or 88-CRIME.