A Spring Valley woman has pleaded guilty to the death of her one year-old son last June. Rockland’s D.A. Tom Walsh says 36 year-old Marie Dorleus admitted she left her three young children unsupervised for several hours in their home. While she was out, her infant son asphyxiated after becoming stuck in a box spring that was leaning against a wall. She is scheduled to be sentenced in December and she faces the maximum of one and one-third years to four years in state prison.