Law & Order S15E15 - Obsession

After a controversial and conservative talk show host is shot to death, Detectives Fontana and Green consider a wealth of likely suspects but focus on Miranda (Paula Devicq), who would inherit his estate only upon death, as well as on Karen (Dana Eskelson), a tormented woman who claims she had an affair with the new widow. As new ADA Borgia sizes up the case, she finds disturbing evidence that Karen was stalking the widow, whose secret love life yields a treasure trove of evidence.