Another Way to Die (Sam Leroy)

The City of Los Angeles holds its breath as LAPD detective Sam Leroy pits his wits against a cruel and brilliant serial killer.
Seven years ago, Leroy shot and killed Harlan Cordell, and breathed a sigh of relief that the reign of the infamous Pentagram Killer was over.
But now, the killings have begun again.
The police believe they are dealing with some fanatical copycat, but these new murders share a small detail with those before, which only the police and the killer would know.
How can today's killer know the intimate details of seven years ago?
Or, as he fears, did Leroy kill the wrong man, leaving the real Pentagram Killer to wait and resume his grisly trade on an unsuspecting city?