The Westchester Incident was an event that occurred in 2028 of the revised timeline. After developing a degenerative brain disease, Charles Xavier had a seizure and lost control of his powers, causing six hundred people to be injured and the deaths of several members of the X-Men, in addition to the permanent destruction of Xavier's School for Gifted Youngsters. As a result, Charles Xavier's brain was declared a "weapon of mass destruction" by the U.S. government forcing him and Logan to hide in Mexico, near the edge of the Mexican-American border.
Sometime after the incident, Logan began giving Charles medication so similar attacks won't occur. Once an attack begins, only Logan and Laura have the ability to move and sedate him, although both have great difficulty doing so.
After Charles experienced another seizure that telepathically paralyzed everyone present at a hotel-casino in Oklahoma City, a radio broadcast noted similarities to the Westchester Incident while Logan, Charles, and Laura were driving away.
- James Mangold, the director and co-writer of Logan, originally planned to have the film open with the deaths of the X-Men. He decided to scrap the idea to keep Logan character-driven, instead of having the X-Men's tragic deaths be the primary focus of the film.
- The Westchester Incident is reminiscent of how the X-Men were killed in the original Old Man Logan storyline. Like it's comics counterpart, the death of the X-Men involved a member of the team (Wolverine/Charles Xavier) accidentally killing them and becoming ashamed at what they done.