Amanda Marissa McCauley, 42, remembered after three deaths at Sioux City home on Douglas Street

 Saturday morning brought a devastating loss to Sioux City, Iowa, where Amanda Marissa McCauley, 42, became one of three people killed in a shooting at a residence on Douglas Street. For her family, the violence ended the life of a mother whose presence was deeply woven into the lives of her children and loved ones. Her sudden passing has left those who knew her grieving deeply for years to come and friends.

Sioux City police said officers were called at approximately 8:15 a.m. on September 26, 2026, to a residence in the 3100 block of Douglas Street near Grandview Park after receiving a report of a shooting. When officers arrived, they found two women and one man suffering from fatal gunshot wounds. The response quickly became a homicide investigation involving three members of the same family, bringing an immediate shock to people connected to the home and others.

Authorities identified the victims as Amanda, her mother, 76-year-old Yolanda Guerra Koon, and Amanda’s husband, 42-year-old Andrew McCauley. Police said investigators determined that Andrew fatally shot Amanda and Yolanda before taking his own life. The deaths brought a sudden end to three lives and left relatives confronting a loss that crossed generations within the family. Their family bonds made the loss painful.

For Amanda’s children, the tragedy carries a deeply personal dimension. She was the mother of two children, including a 13-year-old, and her death means they must now face the years ahead without the woman who had been their mother. The absence will be felt through ordinary moments, family traditions, and memories that cannot be replaced. Those moments can be especially difficult.

Amanda’s death also represents the loss of a daughter and a wife, roles that connected her to the people closest to her. Those relationships help explain why the aftermath reaches far beyond the residence where the shooting occurred. Relatives and friends are now left remembering the person they knew while absorbing the reality of losing her alongside her mother and husband. The connections among the victims make the grief especially difficult.

The investigation continues as authorities work to understand the circumstances surrounding the shooting and what led to the deaths. Police have publicly described the sequence in which Andrew killed Amanda and Yolanda before taking his own life, but the broader circumstances behind the violence remain under investigation. The families affected are left confronting questions that may not have immediate answers.

Near Grandview Park, the residence became the setting for a tragedy that will remain painful for the McCauley and Guerra Koon families. Yet Amanda’s story is not defined only by the circumstances of her death. To her children and loved ones, she was a mother, daughter, wife, and familiar presence whose importance was built through relationships and the life she shared with others in coming years.

The loss of Amanda Marissa McCauley leaves two children without their mother and a family mourning three lives at once. Grief will be shaped by memories of the people her loved ones knew before the tragedy. For those closest to Amanda, her enduring legacy will remain in the family bonds, memories, and love she leaves behind.