diff --git a/wp-admin/includes/ms.php b/wp-admin/includes/ms.php
index bb8b856f08..d218c41920 100644
--- a/wp-admin/includes/ms.php
+++ b/wp-admin/includes/ms.php
@@ -101,6 +101,7 @@ function wpmu_delete_blog($blog_id, $drop = false) {
 		restore_current_blog();
 }
 
+// @todo Merge with wp_delete_user() ?
 function wpmu_delete_user($id) {
 	global $wpdb;
 
@@ -131,8 +132,10 @@ function wpmu_delete_user($id) {
 	$wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->users WHERE ID = %d", $id) );
 	$wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->usermeta WHERE user_id = %d", $id) );
 
-	wp_cache_delete($id, 'users');
-	wp_cache_delete($user->user_login, 'userlogins');
+	clean_user_cache($id);	
+
+	// allow for commit transaction
+	do_action('deleted_user', $id);
 
 	return true;
 }
@@ -449,8 +452,8 @@ function refresh_user_details($id) {
 	if ( !$user = get_userdata( $id ) )
 		return false;
 
-	wp_cache_delete($id, 'users');
-	wp_cache_delete($user->user_login, 'userlogins');
+	clean_user_cache($id);
+
 	return $id;
 }
 
diff --git a/wp-admin/includes/user.php b/wp-admin/includes/user.php
index 448efee657..f99cdfe8a2 100644
--- a/wp-admin/includes/user.php
+++ b/wp-admin/includes/user.php
@@ -419,7 +419,7 @@ function get_users_drafts( $user_id ) {
  * @param int $reassign Optional. Reassign posts and links to new User ID.
  * @return bool True when finished.
  */
-function wp_delete_user($id, $reassign = 'novalue') {
+function wp_delete_user( $id, $reassign = 'novalue' ) {
 	global $wpdb;
 
 	$id = (int) $id;
@@ -428,11 +428,11 @@ function wp_delete_user($id, $reassign = 'novalue') {
 	// allow for transaction statement
 	do_action('delete_user', $id);
 
-	if ($reassign == 'novalue') {
+	if ( 'novalue' === $reassign || null === $reassign ) {
 		$post_ids = $wpdb->get_col( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE post_author = %d", $id) );
 
-		if ($post_ids) {
-			foreach ($post_ids as $post_id)
+		if ( $post_ids ) {
+			foreach ( $post_ids as $post_id )
 				wp_delete_post($post_id);
 		}
 
@@ -443,7 +443,6 @@ function wp_delete_user($id, $reassign = 'novalue') {
 			foreach ( $link_ids as $link_id )
 				wp_delete_link($link_id);
 		}
-
 	} else {
 		$reassign = (int) $reassign;
 		$wpdb->update( $wpdb->posts, array('post_author' => $reassign), array('post_author' => $id) );
@@ -459,10 +458,7 @@ function wp_delete_user($id, $reassign = 'novalue') {
 		$wpdb->query("DELETE FROM $wpdb->usermeta WHERE user_id = $id AND meta_key = '{$level_key}'");
 	}
 
-	wp_cache_delete($id, 'users');
-	wp_cache_delete($user->user_login, 'userlogins');
-	wp_cache_delete($user->user_email, 'useremail');
-	wp_cache_delete($user->user_nicename, 'userslugs');
+	clean_user_cache($id);
 
 	// allow for commit transaction
 	do_action('deleted_user', $id);
diff --git a/wp-includes/user.php b/wp-includes/user.php
index 7bff9f25c7..9bdf216d61 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -735,4 +735,21 @@ function sanitize_user_field($field, $value, $user_id, $context) {
 	return $value;
 }
 
+/**
+ * Clean all user caches
+ *
+ * @since 3.0
+ *
+ * @param int $id User ID
+ * @return void
+ */
+function clean_user_cache($id) {
+	$user = new WP_User($id);
+
+	wp_cache_delete($id, 'users');
+	wp_cache_delete($user->user_login, 'userlogins');
+	wp_cache_delete($user->user_email, 'useremail');
+	wp_cache_delete($user->user_nicename, 'userslugs');
+}
+
 ?>