There are 3 books in the Nick Stefanos series. The newest book is Down by the River Where the Dead Men Go which came out in 1995.

1
A Firing Offense

Book cover of A Firing Offense
As the advertising director of Nutty Nathan's, Nick Stefanos knows all the tricks of the electronics business. Blow-out sales and shady deals were his life. When one of the stockboys disappears, it's not news: just another metalhead who went off chasing some dream of big money and easy living. But…
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2
Nick's Trip

Book cover of Nick's Trip
In this superbly crafted DC noir, hard-drinking Nick Stefanos is hired to find a friend's missing wife -- if he doesn't hit rock bottom first.

Nick Stefanos has given up his job in sales to tend bar at the Spot, where drinks and women are both a bit too easily…