Lee Miller Fuller, 71, who practiced law in Rockville until her retirement in the mid-1960s and who was a resident of Montgomery County much of her life, died of cancer Sunday at Memorial Hospital in Easton, Md.

Mrs. Fuller, who was born in Dickerson and grew up there, earned her law degree at Southeastern University in Washington. She was a partner in the firm of Miller, Miller & Canby until her retirement.

In 1963, she moved to Galesville, Mr., and in 1970 from there to Talbot County on the Eastern Shore.

She was a member of the Maryland and Montgomery County bar associations. She also was a member of the West River Sailing Club in Galesville, the Talbot County Country Club and the board of the Junior Auxillary of Memorial Hospital in Easton. She lived in Bozman, Md., at the time of her death.

Her first husband, James R. Miller, died in 1975.

Survivors include her husband, W. Morris Fuller of Bozman; four stepsons, Judge James R. Miller Jr. of Baltimore, Frederick D. Miller of Hagerstown, Thomas C. Miller of Bethesda, and William M. Fuller of Dayton, Ohio, and nine grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society, or to Memorial Hospital, Easton, Md., 21601.