Former Sun Valley Mayor Ruth Lieder died Monday night of natural causes.

     Blaine County Coroner Russ Mikel said Lieder collapsed at her condominium on Saddle Road about 10:15 p.m. while returning home after walking her dog. Mikel said a cause of death has not yet been established.

     He said neighbors told him that Lieder had not been feeling well recently.

     Lieder was Sun Valley’s mayor for three consecutive terms from 1981 to 1994, and was a councilwoman from 1979 to 1981.