Please answer the following question: Facts:   - conviction: 17 february 1900    - charge: murder    - conviction status: executed    - conviction penalty: death -lrb- by hanging -rrb-    - death date: 6 march 1900 -lrb- aged 24 -rrb-    - spouse: william chard williams      - alias: mrs hewetson    - birth date: circa 1875    - name: ada chard williams    - death place: newgate prison , london , england   Based on these bullet points, write a short biography describing the life of ada williams -lrb- baby farmer -rrb- .
Answer:
ada chard williams -lrb- 1875 -- 1900 -rrb- was a baby farmer who was convicted of strangling to death 21-month-old selina ellen jones in barnes in london in september 1899 .florence jones , a young unmarried mother , had read an advert in the local newspaper which offered to find homes for unwanted children .she agreed to pay # 5 to a mrs hewetson -lrb- ada chard williams -rrb- but could only give her # 3 on the day .being an honest woman , she went back later with the balance and found that mrs hewetson and selina had vanished .florence reported the matter to the police .ada chard williams wrote a letter to the police denying the crime but in effect admitting she was a baby farmer who bought and sold babies for profit .the police soon discovered that mrs hewetson was ada chard williams .however , they had no body with which to prove there had been a murder , at least not until selina 's corpse was washed up on the bank of the thames at battersea .like amelia dyer , ada chard williams had her own `` signature '' way of tying up bodies she wished to dispose of , using a knot called a fisherman 's knot or bend and which was a crucial piece of evidence at her trial at the old bailey on 16 and 17 february 1900 .she was hanged , aged 24 , in the yard of newgate prison on 6 march 1900 , the last woman to be hanged there .she was suspected of killing other children although no proceedings were brought .