San Francisco Chronicle's Daniel King conducted some very personal interviews with one of the lead inspectors on the case and a former Chronicle reporter who received a letter from the killer. On the SFC website you can listen to the podcast ...
These interviews date back to october 2005, when David Fincher's ZODIAC movie was still in pre-production. For this matter it focusses on the experiences of the two interviewees and how they remember the violence and terror of the Zodiac Killer.
For more backstory on the Zodiac case, listen to the podcast here: