Another update, this time pointing out gaps - a work in progress. The timeline is entirely based on links provided at this website. Please feel free to make corrections/ updates.
EARLY
childhood - spondylolisthesis diagnosis
EDUCATION
2016 - completed high school; nominated valedictorian
2020 - completed engineering bachelor degree in computers and MSc. (2 degrees in 4 years; remarkable)
WORK
November 2020 - started work with True Car, Inc. in California
December 2020-December 2021 - ?? WHERE WAS HE? SF?
January 2022 - moved to Surfbreak, Honolulu remote-workers community
Early 2022 - Surfbreak co-living community, Honolulu, active in daily sports
January 2022 - sciatica, beginner surf lesson injury, one week in bed
February 2022 - slipped on piece of paper, right glute locked and right leg shut down for a week, leg couldn't support weight
March 2022 - nerve pain issues, experienced pain off and on
April 2022 - left Surfbreak community due to a lifelong back injury exacerbated by physical activity on the island, sought medical treatment on the East Coast
?? May-December 2022 - living in San Fransisco?
January 2023 - returned to Hawaii "briefly in early 2023", co-started a book club; several members left due to discomfort in book choices (Unabomber manifesto)
?? date 2023 - met President of the Penn Club of Hawaii briefly at Shangri La Museum of Islamic Art, Culture & Design in Honolulu
June 14 2023 - lost job due to True Car Inc. restructuring, kept it secret from family until arrest
UNEMPLOYED TRAVELLER
July 4 2023 - experienced another injury, went to hospital
July 27 2023 - had spinal fusion surgery on East Coast (check date)
August 2023 - reported surgery was successful 8 days post-surgery
?? date Japan - perhaps looking for work?
November-December 2023 - Hawaii, visiting Maui, Big Island, Oahu
December 2023 - returned to Baltimore to see his family.
February 2024 - Mangione said the surgery came "after 1.5 years of failed conservative treatment." (Jan 2022-July 2023)
Early 2024 - Mangione traveled to Asia for several months
April 2024 - Thailand
CONTEMPLATING MURDER
May 25 2024 - last reddit post where he endorsed back surgery
June 10 2024 - last twitter post; anniversary of Unabomber death by suicide, final X.com post shared: impact of smart phones and social media on mental health and brain plasticity
?? 2024 - San Francisco?
July 2024 - friend wrote that he hadn’t heard from Mangione in months regarding wedding commitment
July 2024 - began forming murder plan, stopped talking to friends and family
September-October 2024 - Honolulu
September 2024 - Mangione removed phone number from WhatsApp group for Penn alumni in Hawaii
October 2024 - friend asks Mangione on twitter whether he is okay
November 18 2024 - reported missing by mother in San Francisco.
December 4 2024 - shoots a stranger in the back