diff --git a/src/modules/csm/checkpoint.py b/src/modules/csm/checkpoint.py
index bd5d60a0f..df0976755 100644
--- a/src/modules/csm/checkpoint.py
+++ b/src/modules/csm/checkpoint.py
@@ -1,7 +1,7 @@
 import logging
-from collections import UserDict
+from collections import UserDict, defaultdict
 from concurrent.futures import ThreadPoolExecutor, as_completed
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from itertools import batched
 from threading import Lock
 from typing import Iterable, Sequence, TypeGuard
@@ -33,6 +33,10 @@ class SlotOutOfRootsRange(Exception): ...
 class FrameCheckpoint:
     slot: SlotNumber  # Slot for the state to get the trusted block roots from.
     duty_epochs: Sequence[EpochNumber]  # NOTE: max 255 elements.
+    raw_attestations: defaultdict[ValidatorIndex, list[bool | None]] = field(init=False)
+
+    def __post_init__(self):
+        self.raw_attestations = defaultdict(lambda: [None] * len(self.duty_epochs))
 
 
 @dataclass
@@ -158,7 +162,8 @@ def exec(self, checkpoint: FrameCheckpoint) -> int:
             duty_epoch: self._select_block_roots(block_roots, duty_epoch, checkpoint.slot)
             for duty_epoch in unprocessed_epochs
         }
-        self._process(block_roots, checkpoint.slot, unprocessed_epochs, duty_epochs_roots)
+        self._process(checkpoint, block_roots, unprocessed_epochs, duty_epochs_roots)
+        self._finalize(checkpoint)
         self.state.commit()
         return len(unprocessed_epochs)
 
@@ -201,8 +206,8 @@ def _select_block_root_by_slot(block_roots: list[BlockRoot | None], checkpoint_s
 
     def _process(
         self,
+        checkpoint: FrameCheckpoint,
         checkpoint_block_roots: list[BlockRoot | None],
-        checkpoint_slot: SlotNumber,
         unprocessed_epochs: list[EpochNumber],
         duty_epochs_roots: dict[EpochNumber, tuple[list[SlotBlockRoot], list[SlotBlockRoot]]]
     ):
@@ -211,8 +216,8 @@ def _process(
             futures = {
                 executor.submit(
                     self._check_duties,
+                    checkpoint,
                     checkpoint_block_roots,
-                    checkpoint_slot,
                     duty_epoch,
                     *duty_epochs_roots[duty_epoch]
                 )
@@ -228,11 +233,28 @@ def _process(
             executor.shutdown(wait=True, cancel_futures=True)
             logger.info({"msg": "The executor was shut down"})
 
+    @timeit(lambda args, duration: logger.info({"msg": f"Checkpoint slot {args.checkpoint.slot} processing finalized in {duration:.2f} seconds"}))
+    def _finalize(self, checkpoint: FrameCheckpoint) -> None:
+        logger.info({"msg": "Finalizing checkpoint processing"})
+        checkpoint_l_epoch = min(checkpoint.duty_epochs)
+        for validator_index, raw_attestations in checkpoint.raw_attestations.items():
+            slashing_epoch = self.state.slashings.get(validator_index)
+            if slashing_epoch is not None:
+                if slashing_epoch <= checkpoint_l_epoch:
+                    continue
+                stop_index = checkpoint.duty_epochs.index(slashing_epoch)
+            else:
+                stop_index = len(checkpoint.duty_epochs)
+            for epoch, att_result in zip(checkpoint.duty_epochs[:stop_index], raw_attestations[:stop_index]):
+                if att_result is None:
+                    continue
+                self.state.increment_att_duty(epoch, validator_index, included=att_result)
+
     @timeit(lambda args, duration: logger.info({"msg": f"Epoch {args.duty_epoch} processed in {duration:.2f} seconds"}))
     def _check_duties(
         self,
+        checkpoint: FrameCheckpoint,
         checkpoint_block_roots: list[BlockRoot | None],
-        checkpoint_slot: SlotNumber,
         duty_epoch: EpochNumber,
         duty_epoch_roots: list[SlotBlockRoot],
         next_epoch_roots: list[SlotBlockRoot],
@@ -240,14 +262,18 @@ def _check_duties(
         logger.info({"msg": f"Processing epoch {duty_epoch}"})
 
         att_committees = self._prepare_att_committees(duty_epoch)
-        propose_duties = self._prepare_propose_duties(duty_epoch, checkpoint_block_roots, checkpoint_slot)
+        propose_duties = self._prepare_propose_duties(duty_epoch, checkpoint_block_roots, checkpoint.slot)
         sync_committees = self._prepare_sync_committee(duty_epoch, duty_epoch_roots)
+        slashings = []
 
         for slot, root in [*duty_epoch_roots, *next_epoch_roots]:
             missed_slot = root is None
             if missed_slot:
                 continue
-            attestations, sync_aggregate = self.cc.get_block_attestations_and_sync(root)
+            (
+                attestations, sync_aggregate, proposer_slashings, attester_slashings
+            ) = self.cc.get_block_attestations_and_sync(root)
+            slashings.extend(process_slashings(proposer_slashings, attester_slashings))
             process_attestations(attestations, att_committees)
             if (slot, root) in duty_epoch_roots:
                 propose_duties[slot].included = True
@@ -256,13 +282,16 @@ def _check_duties(
         with lock:
             if duty_epoch not in self.state.unprocessed_epochs:
                 raise ValueError(f"Epoch {duty_epoch} is not in epochs that should be processed")
+
+            for validator_index in slashings:
+                self.state.add_slashing(validator_index, duty_epoch)
+            # Because of slashing case we need to
+            # put aside attestation results for handling later (at the end of the checkpoint processing)
+            epoch_checkpoint_index = checkpoint.duty_epochs.index(duty_epoch)
             for att_committee in att_committees.values():
                 for att_duty in att_committee:
-                    self.state.increment_att_duty(
-                        duty_epoch,
-                        att_duty.validator_index,
-                        included=att_duty.included,
-                    )
+                    checkpoint.raw_attestations[att_duty.validator_index][epoch_checkpoint_index] = att_duty.included
+
             for sync_committee in sync_committees.values():
                 for sync_duty in sync_committee:
                     self.state.increment_sync_duty(
@@ -270,6 +299,7 @@ def _check_duties(
                         sync_duty.validator_index,
                         included=sync_duty.included,
                     )
+
             for proposer_duty in propose_duties.values():
                 self.state.increment_prop_duty(
                     duty_epoch,
@@ -454,3 +484,17 @@ def _bytes_to_bool_list(bytes_: bytes, count: int | None = None) -> list[bool]:
     count = count if count is not None else len(bytes_) * 8
     # copied from https://github.com/ethereum/py-ssz/blob/main/ssz/sedes/bitvector.py#L66
     return [bool((bytes_[bit_index // 8] >> bit_index % 8) % 2) for bit_index in range(count)]
+
+
+def process_slashings(proposer_slashings, attester_slashings):
+    slashed_indexes = []
+    for proposer_slashing in proposer_slashings:
+        signed_header_1 = proposer_slashing['signed_header_1']
+        slashed_indexes.append(signed_header_1['message']['proposer_index'])
+
+    for attester_slashing in attester_slashings:
+        attestation_1 = attester_slashing['attestation_1']
+        attestation_2 = attester_slashing['attestation_2']
+        attesters = set(attestation_1['attesting_indices']).intersection(attestation_2['attesting_indices'])
+        slashed_indexes.extend(attesters)
+    return slashed_indexes
diff --git a/src/modules/csm/state.py b/src/modules/csm/state.py
index 581197e5e..c3b4982ca 100644
--- a/src/modules/csm/state.py
+++ b/src/modules/csm/state.py
@@ -63,6 +63,7 @@ def merge(self, other: Self) -> None:
 
 type Frame = tuple[EpochNumber, EpochNumber]
 type StateData = dict[Frame, NetworkDuties]
+type SlashingsData = dict[ValidatorIndex, EpochNumber]
 
 
 class State:
@@ -77,6 +78,8 @@ class State:
     """
     frames: list[Frame]
     data: StateData
+    # TODO: fetch slashings from l_epoch_first block state to have it in State initially
+    slashings: SlashingsData
 
     _epochs_to_process: tuple[EpochNumber, ...]
     _processed_epochs: set[EpochNumber]
@@ -88,6 +91,7 @@ def __init__(self) -> None:
         self.data = {}
         self._epochs_to_process = tuple()
         self._processed_epochs = set()
+        self.slashings = {}
 
     EXTENSION = ".pkl"
 
@@ -175,6 +179,9 @@ def increment_sync_duty(self, epoch: EpochNumber, val_index: ValidatorIndex, inc
         frame = self.find_frame(epoch)
         self.data[frame].syncs[val_index].add_duty(included)
 
+    def add_slashing(self, val_index: ValidatorIndex, epoch: EpochNumber) -> None:
+        self.slashings[val_index] = epoch
+
     def add_processed_epoch(self, epoch: EpochNumber) -> None:
         self._processed_epochs.add(epoch)
 
diff --git a/src/providers/consensus/client.py b/src/providers/consensus/client.py
index 36e7d9ef1..bdd4a6983 100644
--- a/src/providers/consensus/client.py
+++ b/src/providers/consensus/client.py
@@ -121,7 +121,7 @@ def get_block_details(self, state_id: SlotNumber | BlockRoot) -> BlockDetailsRes
         return BlockDetailsResponse.from_response(**data)
 
     @lru_cache(maxsize=variables.CSM_ORACLE_MAX_CONCURRENCY * 32 * 2)  # threads count * blocks * epochs to check duties
-    def get_block_attestations_and_sync(self, state_id: SlotNumber | BlockRoot) -> tuple[list[BlockAttestation], SyncAggregate]:
+    def get_block_attestations_and_sync(self, state_id: SlotNumber | BlockRoot) -> tuple[list[BlockAttestation], SyncAggregate, list, list]:
         """Spec: https://ethereum.github.io/beacon-APIs/#/Beacon/getBlockV2"""
         data, _ = self._get(
             self.API_GET_BLOCK_DETAILS,
@@ -133,8 +133,10 @@ def get_block_attestations_and_sync(self, state_id: SlotNumber | BlockRoot) -> t
 
         attestations = [BlockAttestationResponse.from_response(**att) for att in data["message"]["body"]["attestations"]]
         sync = SyncAggregate.from_response(**data["message"]["body"]["sync_aggregate"])
+        proposer_slashings = data["message"]["body"]["proposer_slashings"]
+        attester_slashings = data["message"]["body"]["attester_slashings"]
 
-        return cast(list[BlockAttestation], attestations), sync
+        return cast(list[BlockAttestation], attestations), sync, proposer_slashings, attester_slashings
 
     @list_of_dataclasses(SlotAttestationCommittee.from_response)
     def get_attestation_committees(