Katherine V. Forrest: Murder by Tradition (USA 2003)

From the Publisher:
When a successful gay restaurateur is stabbed to death, Kate Delafield's investigation puts her in conflict with her own fear of being outed as a lesbian. Can Kate testify for the prosecution with her integrity intact, when the killer's attorney, the only man who knows the truth about Kate's sexuality, prepares a "homosexual panic" defense?

Katherine V. Forrest: Murder by Tradition. A Kate Delafield Mystery. Alyson Publications, ISBN: 1555837190 (September, 2003), 280 p., $12.95.