She graduated from Ambassador College with her B.A. in 1971.
She was a professional chef for 14 years; her mysteries include culinary elements. Hart began the Jane Lawless series in 1989, it is an early post-Stonewall example of the mystery genre in lesbian literature.
Hart has also taught introductory classes for mystery writers at The Loft Literary Center in Minneapolis for many years.
In 2005 Hart was inducted into the Saints and Sinners Hall of Fame, joining literary greats such as Dorothy Allison, Felice Picano, Katherine V. Forrest, and others. She is also a founding member of The Minnesota Crime Wave.
Hart is openly lesbian.
Hart is married to a woman. Her life partner is Kathleen Linda Kruger. The couple has 3 children: Shawna Kruger Gibson, Tom Gibson, Bethany Kruger.