As a subject matter expert in comic book lore, I can provide you with a detailed answer to your question.
Richard and Mary Parker, Spider-Man's parents, were killed by a man named
Dr. Noah Bomer. Dr. Bomer was a scientist who worked alongside Richard Parker, Peter Parker's father. The story goes that Richard and Mary were involved in a covert government project, and when they decided to leave due to ethical concerns, they were murdered to keep the project a secret. Dr. Bomer was the one who pulled the trigger. This information is not widely known because it was revealed in a comic book series that is considered non-canon by many fans, but it is an interesting piece of Spider-Man's backstory.
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