After four weeks of sharply conflicting testimony and horrifying photographs of a two-month old child dead from malnutrition, a Bronx Supreme Court jury took less than three hours yesterday to convict Tabitha Walrond of criminally negligent homicide in the 1997 death of her son, Tyler.

The verdict came after prosecutor Robert Holdman delivered an emotional closing argument in which he charged that Ms. Walrond let Tyler starve to death in retaliation against Keenan Purrell, the child’s father and her former lover.