WordPress at a glance
action is not described

delete_user action-hook . WP 2.0.0

Fires immediately before a user is deleted from the database.

Usage

add_action( 'delete_user', 'action_function_name_732', 10, 3 );
function action_function_name_732( $id, $reassign, $user ){
	// action...
}
$id(int)
ID of the user to delete.
$reassign(int/null)
ID of the user to reassign posts and links to.
Default: null, for no reassignment
$user(WP_User)
WP_User object of the user to delete.

Changelog

Since 2.0.0 Introduced.
Since 5.5.0 Added the $user parameter.

Where the hook is called

wp_delete_user()
delete_user
wp-admin/includes/user.php 368
do_action( 'delete_user', $id, $reassign, $user );

Where in WP core the hook is used WordPress

Usage not found.