Authorities said the 73-year-old neighbor confronted people at the House Springs home before shooting the mother and her daughter.
HOUSE SPRINGS, Mo. — A Missouri mother and her 17-year-old daughter died after authorities say a neighbor shot them during a confrontation at their House Springs home, then shot himself when deputies approached him. The neighbor later died from his injuries.
Jessica Lashly, 38, and her daughter, Jersey Greer, 17, were critically wounded during the July 25 shooting on Doetzel Drive in Jefferson County. Both died at an area hospital on July 27, according to the Jefferson County Sheriff’s Office. The suspected shooter, 73-year-old Robert Winkelman, remained hospitalized after the shooting and died Aug. 2. Because Winkelman died, the criminal case against him cannot proceed to trial.
Investigators said Winkelman walked to the neighboring residence at about 8:30 p.m. and began questioning people there about activities at the home. The Sheriff’s Office said investigators learned Winkelman had ongoing frustrations about those activities. Some news reports described the dispute as involving noise, but authorities’ public account referred more broadly to activities at the residence and did not fully detail the history of the disagreement.
According to the Sheriff’s Office, Lashly made a comment during the encounter and Winkelman allegedly pulled out a gun and shot her. Greer then attempted to provide first aid to her mother, and authorities said Winkelman shot the teenager as well. Investigators also said Winkelman chased a third person, who was not reported injured.
Deputies responding to the shooting learned that Winkelman was outside his residence across the street, authorities said. When deputies approached him, he shot himself. Lashly, Greer and Winkelman were all taken to hospitals in critical condition. The Sheriff’s Office later announced the deaths of Lashly and Greer, followed days later by Winkelman’s death.
Prosecutors initially charged Winkelman with two counts of first-degree assault and two counts of armed criminal action while he remained hospitalized. After Lashly and Greer died, the Jefferson County Prosecuting Attorney’s Office upgraded the case to two counts of first-degree murder and two counts of armed criminal action, according to the Sheriff’s Office. A no-bond warrant had been issued before Winkelman died.
Greer was preparing for her senior year at Northwest High School and played lacrosse with her twin sister, Justice Greer. Justice, who was at work when the shooting occurred, later told KSDK that her sister’s effort to help their mother showed how brave she was. Friends and teammates also remembered Greer for her humor, kindness and support for others.
Friends said Greer became an organ donor after her death and that her donations benefited six people, including three children and three adults. Her lacrosse community organized fundraising efforts for the surviving family and medical and funeral expenses as relatives and classmates mourned both Greer and Lashly.
The deaths brought an end to the potential prosecution of Winkelman, meaning the allegations against him will not be tested at trial. The Sheriff’s Office has said its investigation found that he had ongoing frustrations involving the neighboring residence, but authorities have not publicly released a more detailed explanation of what led to the confrontation.
Author note: Last updated August 7, 2026.