This should show a list of commits in all branches which touched that file. Then, you can find the version of the file you want, and display it with...
git log --all -- <path-to-file>
git show <SHA> -- <path-to-file>
Get a list of the deleted files and copy the full path of the deleted file
git log --diff-filter=D --summary -- <path-to-file> | grep delete
Execute the next command to find commit id of that commit and copy the commit id
git log --all -- FILEPATH
Show diff of deleted file
git show COMMIT_ID -- FILE_PATH
Remember, you can write output to a file using > like
git show COMMIT_ID -- FILE_PATH > deleted.diff