Euthanasia may remain an indestructible op-ed page debate topic, pitting sanctity of life against quality of life, but there’s blessed little of that sort of forensic analysis in Dr. Death, Jonathan Kellerman’s 14th thriller to feature Los Angeles psychologist Alex Delaware. Instead, we get plenty of the other, gorier kind, as a Kevorkian-like doctor is murdered and Delaware is brought in to help catch the very twisted killer. Though there are too many red herrings and knowing winks at the reader — a line about ”fava beans” and wine is especially clunky — this is a gripping mystery, with a small ethics lesson thrown in as a bonus. B+