diff --git a/pkg/apis/core/types.go b/pkg/apis/core/types.go
index 0f3b7a84800..2a0d8a3acee 100644
--- a/pkg/apis/core/types.go
+++ b/pkg/apis/core/types.go
@@ -4521,21 +4521,8 @@ type EventSeries struct {
 	Count int32
 	// Time of the last occurrence observed
 	LastObservedTime metav1.MicroTime
-	// State of this Series: Ongoing or Finished
-	// Deprecated. Planned removal for 1.18
-	State EventSeriesState
 }
 
-// EventSeriesState defines the state of event series
-type EventSeriesState string
-
-// These are valid values of event series state
-const (
-	EventSeriesStateOngoing  EventSeriesState = "Ongoing"
-	EventSeriesStateFinished EventSeriesState = "Finished"
-	EventSeriesStateUnknown  EventSeriesState = "Unknown"
-)
-
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 
 // EventList is a list of events.
diff --git a/staging/src/k8s.io/api/core/v1/types.go b/staging/src/k8s.io/api/core/v1/types.go
index 5b7f4b8f27e..814040564f1 100644
--- a/staging/src/k8s.io/api/core/v1/types.go
+++ b/staging/src/k8s.io/api/core/v1/types.go
@@ -5215,19 +5215,10 @@ type EventSeries struct {
 	Count int32 `json:"count,omitempty" protobuf:"varint,1,name=count"`
 	// Time of the last occurrence observed
 	LastObservedTime metav1.MicroTime `json:"lastObservedTime,omitempty" protobuf:"bytes,2,name=lastObservedTime"`
-	// State of this Series: Ongoing or Finished
-	// Deprecated. Planned removal for 1.18
-	State EventSeriesState `json:"state,omitempty" protobuf:"bytes,3,name=state"`
+
+	// +k8s:deprecated=state,protobuf=3
 }
 
-type EventSeriesState string
-
-const (
-	EventSeriesStateOngoing  EventSeriesState = "Ongoing"
-	EventSeriesStateFinished EventSeriesState = "Finished"
-	EventSeriesStateUnknown  EventSeriesState = "Unknown"
-)
-
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 
 // EventList is a list of events.
diff --git a/staging/src/k8s.io/api/events/v1beta1/types.go b/staging/src/k8s.io/api/events/v1beta1/types.go
index 0571fbb2e82..6ac9477ef04 100644
--- a/staging/src/k8s.io/api/events/v1beta1/types.go
+++ b/staging/src/k8s.io/api/events/v1beta1/types.go
@@ -95,19 +95,10 @@ type EventSeries struct {
 	Count int32 `json:"count" protobuf:"varint,1,opt,name=count"`
 	// Time when last Event from the series was seen before last heartbeat.
 	LastObservedTime metav1.MicroTime `json:"lastObservedTime" protobuf:"bytes,2,opt,name=lastObservedTime"`
-	// Information whether this series is ongoing or finished.
-	// Deprecated. Planned removal for 1.18
-	State EventSeriesState `json:"state" protobuf:"bytes,3,opt,name=state"`
+
+	// +k8s:deprecated=state,protobuf=3
 }
 
-type EventSeriesState string
-
-const (
-	EventSeriesStateOngoing  EventSeriesState = "Ongoing"
-	EventSeriesStateFinished EventSeriesState = "Finished"
-	EventSeriesStateUnknown  EventSeriesState = "Unknown"
-)
-
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 
 // EventList is a list of Event objects.