There are 2 books in the A Doug Orlando Mystery series. The newest book is False Confessions which came out in 1993.

1
Final Atonement

Book cover of Final Atonement
LAMBDA LITERARY AWARD FINALIST FOR BEST MYSTERY! The bestselling crime novels of New York life in the early nineties are back. Gruff, weary, gay Brooklyn Homicide cop Doug Orlando is facing his most shocking case: Rabbi Avraham Rabowitz lay in a pool of his own blood, a prayer shawl stuffed…
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2
False Confessions

False Confessions
Out of the closet gay New York cop Doug Orlando searches for a serial killer who leaves his victims--most recently, a priest--naked except for dozens of long needles stuck in their bodies. Original.