Unfortunately, the "coming weeks" has now extended to 2 1/2 years with limited hope of a resolution - but all is not lost. Searching for a killer in a pool of potentially millions of people, is like finding a needle in a field of haystacks. Identifying a person of interest and lego-building a case around them in the fashion displayed on the internet has spawned a growing list of suspects, cobbled together with weak circumstantial evidence and viewed through rose-tinted glasses by their promoter. Any inconvenient observation regarding that suspect, which pours huge doubt on their guilt, will be routinely dismissed - an essential prerequisite for anybody with a long-standing fixation or unfaltering conviction in their suspect as the Zodiac Killer. The healthy interest in a person as a likely candidate for the Bay Area murders often metamorphosizes into an unhealthy obsession, in which the author ends up creating something akin to Mary Shelley's Frankenstein - a hideously manufactured humanlike creature that ultimately bears no resemblance to the Zodiac Killer or the facts of the case. The fact we have hundreds of Zodiac suspects in 2020, is testimony to how easy it is to manipulate the communications and crimes to fit our desired choice.
In a case stretching back 50 years, we have to play the odds and drain the ever-growing ocean of suspects by reducing the search field. We can do this by employing the useful tool of geographic profiling and creating a mental map of the killer. This is not a replacement for good old fashioned police work and forensics, but can prioritize where we begin our search, before extending outwards. Dr IPIP (Investigative Psychology for Investigative Practitioners) was created by Dr Susanne Knabe-Nicol, an investigative psychologist. She has created an excellent video playlist of investigative tools on Youtube, including a 53 minute interview with Kim Rossmo, a Canadian criminologist specializing in geographic profiling. This interview should give you an insight into all aspects of geographic profiling and its uses in a criminal investigation such as the Zodiac Killer. Dr Susanne Knabe-Nicol (Dr IPIP) can also be accessed via her website here.