Katherine L. McKinsey was born in Maryland in November 1891 according to the 1900 U.S. Federal Census. She was the fourth of five children born to Folger, a newspaper editor, and Fannie. The family resided in Baltimore at 3014 Baker Street.
In the 1910 census the family lived on a farm in Anne Arundel County, Maryland on Baltimore and Annapolis Road. McKinsey was unemployed.
Baltimore city directories for the years 1914 and 195 listed McKinsey working at the Baltimore Sun newspaper. Beginning November 11, 1917, McKinsey was editor of the Sun’s Yarns for Youngsters Sunday page.
The Sun began publishing Clarence R. Gettier’s From Sue to Lou, with Love on August 1, 1920. McKinsey’s byline appeared on the strip from October 17, 1920 to September 11, 1921.
According to the Baltimore Death Index, McKinsey passed away February 23, 1923.