A violent spree that began on the night of February 27, 2025, left 12-year-old Giuliani Calderon dead and his mother, Mercedes Ontiveros, seriously wounded. Giuliani, a student at Walden Middle School, was shot inside the family home in unincorporated Platte County near Riverside, Missouri.

Authorities say 43-year-old George Manning began the rampage by shooting and killing 33-year-old Katherine Bjorklund at a Riverside car wash and taking her vehicle. Manning then drove to the home he had once shared with Ontiveros, forced entry and opened fire, striking Ontiveros and her son, then abducted the couple’s 5-year-old daughter. An Amber Alert was issued; the child was later released to a relative and found safe.

The manhunt continued into the next morning, with additional offenses reported in Kansas City, Kansas. Manning was located near Vivion Road and Waukomis Drive and was shot and killed by police during the confrontation. Giuliani’s family had previously suffered gun violence: his father, Alfredo Calderon, was killed in a mass shooting in 2019.

If anyone has information about the events of February 27–28 in Platte County or Riverside, please share what you know.