ABC7 Presents: Chasing the Golden State Killer | Part III

SAN FRANCISCO (KGO) -- Solving the case of the "Golden State Killer," also known as the "East Area Rapist," became an obsession for some and a passion for others.

True crime author Michelle McNamara's book "I'll Be Gone in the Dark" inspired a whole slew of arm-chair detectives. Here's more on local sleuths who used their time and energy to research the killer's crimes.

FULL VIDEO: Watch Parts 1, 2, and 3 of "ABC7 Presents: Chasing the Golden State Killer."

RELATED: See all ABC7's stories, photos, videos, and more from the archives about the Golden State Killer.

More about the case of the Golden State Killer

• PARALLEL PATHS: Tracking Joseph James DeAngelo and the Golden State Killer
• WHO IS HE: The life and history Joseph DeAngelo, the alleged Golden State Killer
• 'I hate you Bonnie' Golden State Killer's rage could have been linked to ex
• Local sleuths, inspired by crime writer, aimed to solve Golden State Killer case
• TIMELINE: A look back at the Golden State Killer's crime spree that lasted a decade
• WHO IS HE: The life and history of the 'Golden State Killer'
• Local sleuths, inspired by crime writer, aimed to solve 'Golden State Killer' case
• 'I hate you Bonnie' Golden State Killer's rage could have been linked to ex
• Former Irvine mom speaks out 32 years after daughter was murdered by 'Golden State Killer'
• Report: Suspected 'Golden State Killer' may have had an accomplice
• 'Golden State Killer' suspect once planned to kill ex-police chief who fired him
• Judge rules more evidence may be collected in 'Golden State Killer' case
• VIDEO: What we know about suspected 'Golden State Killer'
• 'Horrific man:' Suspected 'Golden State Killer' begins court proceedings
• 'Golden State Killers' past and present in Sacramento jars neighbors
• Suspected 'Golden State Killer' appears in Sacramento County Court for 1st time
• Visalia detective came face to face with 'Visalia Ransacker' serial killer in 1975
• Daughter of 'Golden State Killer' victim speaks out
• Visalia Ransacker's victim speaks out for the very first time
• Forensic psychologist examines mind of accused 'Golden State Killer'
• FROM THE ARCHIVE: 'Golden State Killer' terrorizes Concord in 1978
• FROM THE ARCHIVE: 'Golden State Killer' investigation moves to Walnut Creek in 1979
• 'Golden State Killer's' past, present in Sacramento jars neighbors
• Suspected 'Golden State Killer' arrested in Northern California