diff --git a/cmd/main.go b/cmd/main.go
index 124f60a..c48a6b7 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -12,6 +12,7 @@ import (
 	"github.com/dappnode/validator-tracker/internal/adapters/dappmanager"
 	"github.com/dappnode/validator-tracker/internal/adapters/notifier"
 	"github.com/dappnode/validator-tracker/internal/adapters/web3signer"
+	"github.com/dappnode/validator-tracker/internal/application/domain"
 	"github.com/dappnode/validator-tracker/internal/application/services"
 	"github.com/dappnode/validator-tracker/internal/config"
 	"github.com/dappnode/validator-tracker/internal/logger"
@@ -46,11 +47,12 @@ func main() {
 
 	// Start the duties checker service in a goroutine
 	dutiesChecker := &services.DutiesChecker{
-		Beacon:       beacon,
-		Signer:       web3Signer,
-		Notifier:     notifier,
-		Dappmanager:  dappmanager,
-		PollInterval: 1 * time.Minute,
+		Beacon:          beacon,
+		Signer:          web3Signer,
+		Notifier:        notifier,
+		Dappmanager:     dappmanager,
+		PollInterval:    1 * time.Minute,
+		SlashedNotified: make(map[domain.ValidatorIndex]bool),
 	}
 	wg.Add(1)
 	go func() {
diff --git a/internal/adapters/beacon/beacon.go b/internal/adapters/beacon/beacon.go
index 4a36207..6e27f0a 100644
--- a/internal/adapters/beacon/beacon.go
+++ b/internal/adapters/beacon/beacon.go
@@ -178,7 +178,7 @@ func (b *beaconAttestantClient) GetValidatorIndicesByPubkeys(ctx context.Context
 	// Only get validators in active states
 	// TODO: why do I need apiv1 for this struct? is there something newer?
 	validators, err := b.client.Validators(ctx, &api.ValidatorsOpts{
-		State:   "head",
+		State:   "justified",
 		PubKeys: beaconPubkeys,
 		ValidatorStates: []v1.ValidatorState{
 			v1.ValidatorStateActiveOngoing,
@@ -260,6 +260,28 @@ func (b *beaconAttestantClient) GetValidatorsLiveness(ctx context.Context, epoch
 	return livenessMap, nil
 }
 
+// GetSlashedValidators retrieves the indices of slashed validators. In the justified state.
+func (b *beaconAttestantClient) GetSlashedValidators(ctx context.Context, indices []domain.ValidatorIndex) ([]domain.ValidatorIndex, error) {
+	slashed, err := b.client.Validators(ctx, &api.ValidatorsOpts{
+		State: "justified",
+		// Only get validators in slashed states
+		ValidatorStates: []v1.ValidatorState{
+			v1.ValidatorStateActiveSlashed,
+			v1.ValidatorStateExitedSlashed,
+		},
+		Indices: make([]phase0.ValidatorIndex, len(indices)),
+	})
+
+	if err != nil {
+		return nil, err
+	}
+	slashedIndices := make([]domain.ValidatorIndex, 0, len(slashed.Data))
+	for _, v := range slashed.Data {
+		slashedIndices = append(slashedIndices, domain.ValidatorIndex(v.Index))
+	}
+	return slashedIndices, nil
+}
+
 // enum for consensus client
 type ConsensusClient string
 
diff --git a/internal/application/ports/beaconchain.go b/internal/application/ports/beaconchain.go
index d320388..60bd533 100644
--- a/internal/application/ports/beaconchain.go
+++ b/internal/application/ports/beaconchain.go
@@ -14,6 +14,7 @@ type BeaconChainAdapter interface {
 	GetCommitteeSizeMap(ctx context.Context, slot domain.Slot) (domain.CommitteeSizeMap, error)
 	GetBlockAttestations(ctx context.Context, slot domain.Slot) ([]domain.Attestation, error)
 	GetValidatorIndicesByPubkeys(ctx context.Context, pubkeys []string) ([]domain.ValidatorIndex, error)
+	GetSlashedValidators(ctx context.Context, indices []domain.ValidatorIndex) ([]domain.ValidatorIndex, error)
 
 	GetProposerDuties(ctx context.Context, epoch domain.Epoch, indices []domain.ValidatorIndex) ([]domain.ProposerDuty, error)
 	DidProposeBlock(ctx context.Context, slot domain.Slot) (bool, error)
diff --git a/internal/application/services/dutieschecker_service.go b/internal/application/services/dutieschecker_service.go
index 1a7b727..4df93e4 100644
--- a/internal/application/services/dutieschecker_service.go
+++ b/internal/application/services/dutieschecker_service.go
@@ -19,6 +19,8 @@ type DutiesChecker struct {
 	lastJustifiedEpoch domain.Epoch
 	lastLivenessState  *bool
 	lastRunHadError    bool
+
+	SlashedNotified map[domain.ValidatorIndex]bool
 }
 
 func (a *DutiesChecker) Run(ctx context.Context) {
@@ -115,6 +117,27 @@ func (a *DutiesChecker) performChecks(ctx context.Context, justifiedEpoch domain
 		}
 	}
 
+	slashed, err := a.Beacon.GetSlashedValidators(ctx, indices)
+	if err != nil {
+		logger.Error("Error fetching slashed validators: %v", err)
+		return err
+	}
+
+	// Notify about slashed validators only if they haven't been notified before
+	var toNotify []domain.ValidatorIndex
+	for _, index := range slashed {
+		if !a.SlashedNotified[index] {
+			toNotify = append(toNotify, index)
+			a.SlashedNotified[index] = true
+		}
+	}
+
+	if len(toNotify) > 0 && notificationsEnabled[domain.ValidatorSlashed] {
+		if err := a.Notifier.SendValidatorsSlashedNot(toNotify); err != nil {
+			logger.Warn("Error sending validator slashed notification: %v", err)
+		}
+	}
+
 	return nil
 }