D. Kent Parker, a retired supervisor of records and information technology for Baltimore County government, died Saturday at Greater Baltimore Medical Center of complications from a fall. He was 77.

The stepson of Halbert Fitz, a salesman, and Margaret Polly Fitz, a homemaker, Donald Kent Parker was born and raised in Westminster. He graduated in 1954 from Westminster High School.

Mr. Parker, who never used his first name and preferred his middle name, attended business school in Baltimore.

In 1955, he began his 40-year career working for Baltimore County government and became a computer programmer in the early 1960s.

He played an instrumental role, family members said, in the establishment and implementation of the 911 system in Baltimore County in the late 1970s and early 1980s. He retired in 1995.

Mr. Parker, a former Cockeysville resident who had lived in Phoenix, Baltimore County, since 1976, was a founding member of the Baltimore County Employee Credit Union and served on its board for 32 years.

Mr. Parker was a collector of Lionel O-gauge trains and also liked to travel and take cruises.

Funeral services will be held at 10 a.m. Thursday at Ruck Towson Funeral Home, 1050 York Road.

Mr. Parker is survived by his wife of 21 years, the former Mary Nancy Nagle; a stepson, Mark Coffman of Perry Hall; two stepdaughters, Patricia Lee Wilson of Salisbury and Jane A. Leech of York, Pa.; seven grandchildren; and eight great-grandchildren. His second wife, the former Nancy Lee Smithberger, died in 1992. A first marriage ended in divorce.

fred.rasmussen@baltsun.com

An earlier version inadvertently omitted Mr. Parker's wife's first name. The Baltimore Sun regrets the error.