Noe pleaded guilty in June 1999 to eight counts of second-degree murder, and was sentenced to 20 years' probation and psychiatric examination.
[3] Marie Lyddy and Arthur Allen Noe (1921–2009) met at a private club in the West Kensington neighborhood of Philadelphia.
[4][5] Interest in the case was renewed after the publication of the 1997 book The Death of Innocents, about New York woman Waneta Hoyt, and an investigative article (Cradle to Grave by Stephen Fried) that appeared in the April 1998 issue of Philadelphia magazine.
As a condition of her plea agreement, Noe agreed to psychiatric study in hopes of identifying what caused her to kill her children.
In September 2001, a study was filed with the court which stated Noe had a mixed-personality disorder with avoidant, dependent, narcissistic, histrionic, borderline, paranoid and antisocial features.