function bp_core_delete_account( $user_id = 0 ) {

	// Use logged in user ID if none is passed.
	if ( empty( $user_id ) ) {
		$user_id = bp_loggedin_user_id();
	}

	// Site admins cannot be deleted.
	if ( is_super_admin( $user_id ) ) {
		return false;
	}

	// Extra checks if user is not deleting themselves.
	if ( bp_loggedin_user_id() !== absint( $user_id ) ) {

		// Bail if current user cannot delete any users.
		if ( ! bp_current_user_can( 'delete_users' ) ) {
			return false;
		}

		// Bail if current user cannot delete this user.
		if ( ! current_user_can_for_blog( bp_get_root_blog_id(), 'delete_user', $user_id ) ) {
			return false;
		}
	}

	/**
	 * Fires before the processing of an account deletion.
	 *
	 * @since 1.6.0
	 *
	 * @param int $user_id ID of the user account being deleted.
	 */
	do_action( 'bp_core_pre_delete_account', $user_id );

	// Specifically handle multi-site environment.
	if ( is_multisite() ) {
		require_once( ABSPATH . '/wp-admin/includes/ms.php'   );
		require_once( ABSPATH . '/wp-admin/includes/user.php' );

		$retval = wpmu_delete_user( $user_id );

	// Single site user deletion.
	} else {
		require_once( ABSPATH . '/wp-admin/includes/user.php' );
		$retval = wp_delete_user( $user_id );
	}

	/**
	 * Fires after the deletion of an account.
	 *
	 * @since 1.6.0
	 *
	 * @param int $user_id ID of the user account that was deleted.
	 */
	do_action( 'bp_core_deleted_account', $user_id );

	return $retval;
}