Robert J. Harris, 61, and his wife, Marie Kelleher Harris, 44, of Ocean City, Md., were killed Aug. 5 when the private airplane Mr. Harris was piloting crashed while approaching the airport in Kodiak, Alaska.

A spokesman for the Federal Aviation Administration said the plane, a twin-engine Piper Comanche, was making an instrument approach to the field when it crashed due to unknown circumstances. The spokesman said the crash is still being investigated.

Mr. Harris was the chairman of Atlantic Pines Inc. and had been a builder and real estate developer in the Washington area and elsewhere for more than 35 years. He began his career in 1949 when he founded Harris Properties here. He became a specialist in resort development and had worked on a number of projects in Ocean City, Bethany Beach, Del., and Myrtle Beach, S.C.

He was born in Elizabeth, N.J. He moved to Washington in 1941 to study at Georgetown University, where he earned bachelor's and law degrees. During World War II, he was a pilot in the Army Air Forces. He lived in Potomac before moving to Ocean City in 1983.

Mrs. Harris was born in Richmond. She graduated from Mary Washington College in 1963. From 1965 to 1975, she lived in Alexandria and worked for Univac Corp. and then for the U.S. Coast and Geodetic Survey. She returned to Richmond and became director of communications services for the Virginia Center for the Visually Handicapped. She continued there until marrying Mr. Harris in 1983.

Mr. Harris' marriage to Jeanne H. Harris ended in divorce.

His survivors include six daughters by his first marriage, Marianne Howell of Chapel Hill, N.C., Nancy J. Jansen of Rockville, Clare K. Coleman of Sea Cliff, N.Y., Elizabeth T. Harris of Ocean City, and Patricia A. and Megan M. Harris, both of Bethesda; two sons by his first marriage, Robert J. Harris Jr. of Fairfax, and William P. Harris of Ocean City; two sisters, Joan P. Harris of McLean, and Audry H. Julian of Orleans, Vt., and seven grandchildren.

Mrs. Harris' survivors include her parents, J. Michael and Marie Kraftt Kelleher, and four brothers, Joseph M. Kelleher Jr., Patrick T. Kelleher, Edward M. Kelleher and Francis J. Kelleher, all of Richmond.