The Last Coyote by Michael Connelly (1995) Little Brown

Bosch has done an almost unforgivable thing by attacking his lieutenant.  Now he is on paid involuntary leave pending a report from the department’s psychiatrist.  And he’s trying to get around his home having been condemned because of an earthquake.  To keep busy, he starts investigating the twenty‑five-year-old murder of his mother.  But there are people still alive who don’t want that done.  Old detectives are either dead or clear across the country.  Witnesses and workers start getting killed – including Bosch’s boss.  How can he uncover the truth without losing his job and his self-worth.