(Associated Press) The children of a woman who was fatally shot by a fellow resident of an Elkhart apartment complex are suing the apartment’s management company, alleging that it failed to protect their mother from the gunman despite knowing of his “peculiar and abhorrent behavior.”

Lawrence Faso shot and killed Gail Shields and her boyfriend Jon Malk on July 31 before killing himself at the Stratford Commons assisted living apartment complex.

The Elkhart Truth reports that Tanya Shields and Cory Shields filed the lawsuit Wednesday in Elkhart County court, saying apartment complex manager APT Management didn’t protect their 66-year-old mother from Faso.