Dershowitz and his brother, Nathan, are preparing an appeal for Dr. Mazoltuv Borukhova.
Borukhova is serving life in prison without parole. Authorities said she hired her cousin to gun down orthodonist Daniel Malakov. He died in a Queens park, in front of their 4-year-old daughter.
The 2007 slaying rocked the close-knit community of Bukharan Jews from the former Soviet republic of Uzbekistan. New York is the home of the largest Bukharan population in the United States.