diff --git a/lib/uh/wm/manager.rb b/lib/uh/wm/manager.rb
index ab09703..1169c5e 100644
--- a/lib/uh/wm/manager.rb
+++ b/lib/uh/wm/manager.rb
@@ -71,6 +71,12 @@ module Uh
         end
       end
 
+      def destroy window
+        return unless client = client_for(window)
+        @clients.delete client
+        @events.emit :unmanage, args: client
+      end
+
       def handle_next_event
         handle @display.next_event
       end
diff --git a/spec/uh/wm/manager_spec.rb b/spec/uh/wm/manager_spec.rb
index 3238b09..478ba39 100644
--- a/spec/uh/wm/manager_spec.rb
+++ b/spec/uh/wm/manager_spec.rb
@@ -214,6 +214,35 @@ module Uh
         end
       end
 
+      describe '#destroy' do
+        before { manager.map window }
+
+        it 'unregisters the client' do
+          expect { manager.destroy window }
+            .to change { manager.clients.size }.from(1).to 0
+        end
+
+        it 'emits :unmanage event with the client' do
+          events.on :unmanage, &block
+          expect(block).to receive(:call).with manager.clients[0]
+          manager.destroy window
+        end
+
+        context 'with unknown window' do
+          let(:unknown_window) { window.dup }
+
+          it 'does not change registered clients' do
+            expect { manager.destroy unknown_window }
+              .not_to change { manager.clients }
+          end
+
+          it 'does not emit any event' do
+            expect(events).not_to receive :emit
+            manager.destroy unknown_window
+          end
+        end
+      end
+
       describe '#handle_next_event' do
         it 'handles the next available event on display' do
           event = double 'event'