In late March 1975 two Upper Darby High School students were found dead in Tinicum Marsh. Fifteen-year-old Mary Ann Lees and 16-year-old Layne Dorothy Spicer were discovered on March 31, 1975, in what became one of several disturbing killings of young women around Philadelphia in the mid-1970s.

Investigators linked the disappearances to a gothic estate known as the Castle, owned by Robert Marconi, which served as a gathering place for the Warlocks motorcycle gang. Stolen goods and weapons were recovered from the property, and several missing women had last been seen at or near the Castle. Despite that connection, authorities were unable to develop direct evidence tying Marconi or others to the murders, and no prosecutions were brought.

The deaths remain unsolved and the families never received legal closure. Does anyone have information about Mary Ann Lees, Layne Spicer, the Castle, or that period in Upper Darby that could help this cold case?