Dean Shillingsworth, 2, whose body was found at a lake in
Ambervale.  Dean Shillingsworth, 2, whose body was found at a
lake in Ambervale. Photo: Dallas Kilponen  A woman killed her
son then stuffed him in a suitcase to prevent his father and
grandmother from gaining custody, a court has heard.  Dean
Shillingsworth's body was found in a pond in Ambarvale on
October 17, 2007.  His mother, Rachel Pfitzner, 27, pleaded
guilty to the two-year-old's murder in August.  During sentence
submissions in the Supreme Court today, Crown prosecutor Mark
Tedeschi, QC, said Pfitzner killed her son on the very day a
local court ordered his paternal grandmother to gain permanent
custody.  The court also heard that, in 2006, Pfitzner
threatened to kill Dean rather than allow him to live with his
grandmother, Ann Coffey.  "I will kill Dean before he goes back
to Ann," the court heard Pfitzner told Dean's grandfather.  Mr
Tedeschi argued that Pfitzner had intended to kill Dean.  "On
two occasions she held him up by his clothing,