Manner of Death Series by Yukari Umemoto, Sammon

When skilled coroner Dr. Bunnakit is called upon to examine the body of a woman who allegedly hanged herself, he soon finds that all evidence points to foul play. That night, a mysterious stranger breaks into his home and demands that he rule the death a suicide―and after he confides in his prosecutor friend about the incident, that friend suddenly goes missing. Dr... moreWhen skilled coroner Dr. Bunnakit is called upon to examine the body of a woman who allegedly hanged herself, he soon finds that all evidence points to foul play. That night, a mysterious stranger breaks into his home and demands that he rule the death a suicide―and after he confides in his prosecutor friend about the incident, that friend suddenly goes missing. Dr. Bunnakit pins all his suspicions on a man named Tan, but not only does Tan have a rock-solid alibi, he also volunteers to help uncover the real murderer… less

Bunnakit, a coroner investigating a murder case, and Tan, the man who was his prime suspect―they have formed an unlikely alliance out of both necessity and passion. But though the two are drawn to each other, more danger awaits them than ever before, and each man has his own hidden motives. When the bodies start piling up, Bun and Tan must race to find the truth, all the while coming to terms with how they really feel about each other…Will their love survive this ultimate test?