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diff --git a/src/core/tsi/alts/handshaker/alts_tsi_event.h b/src/core/tsi/alts/handshaker/alts_tsi_event.h
deleted file mode 100644
index 043e75d4a9..0000000000
--- a/src/core/tsi/alts/handshaker/alts_tsi_event.h
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- *
- * Copyright 2018 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-#ifndef GRPC_CORE_TSI_ALTS_HANDSHAKER_ALTS_TSI_EVENT_H
-#define GRPC_CORE_TSI_ALTS_HANDSHAKER_ALTS_TSI_EVENT_H
-
-#include <grpc/support/port_platform.h>
-
-#include <grpc/byte_buffer.h>
-#include <grpc/byte_buffer_reader.h>
-
-#include "src/core/tsi/alts/handshaker/alts_tsi_handshaker.h"
-#include "src/core/tsi/transport_security_interface.h"
-
-/**
- * A ALTS TSI event interface. In asynchronous implementation of
- * tsi_handshaker_next(), the function will exit after scheduling a handshaker
- * request to ALTS handshaker service without waiting for response to return.
- * The event is used to link the scheduled handshaker request with the
- * corresponding response so that enough context information can be inferred
- * from it to handle the response. All APIs in the header are thread-compatible.
- */
-
-/**
- * Main struct for ALTS TSI event. It retains ownership on send_buffer and
- * recv_buffer, but not on handshaker.
- */
-typedef struct alts_tsi_event {
-  alts_tsi_handshaker* handshaker;
-  grpc_byte_buffer* send_buffer;
-  grpc_byte_buffer* recv_buffer;
-  grpc_status_code status;
-  grpc_slice details;
-  grpc_metadata_array initial_metadata;
-  grpc_metadata_array trailing_metadata;
-  tsi_handshaker_on_next_done_cb cb;
-  void* user_data;
-  grpc_alts_credentials_options* options;
-  grpc_slice target_name;
-} alts_tsi_event;
-
-/**
- * This method creates a ALTS TSI event.
- *
- * - handshaker: ALTS TSI handshaker instance associated with the event to be
- *   created. The created event does not own the handshaker instance.
- * - cb: callback function to be called when handling data received from ALTS
- *   handshaker service.
- * - user_data: argument to callback function.
- * - options: ALTS credentials options.
- * - target_name: name of endpoint used for secure naming check.
- * - event: address of ALTS TSI event instance to be returned from the method.
- *
- * It returns TSI_OK on success and an error status code on failure.
- */
-tsi_result alts_tsi_event_create(alts_tsi_handshaker* handshaker,
-                                 tsi_handshaker_on_next_done_cb cb,
-                                 void* user_data,
-                                 grpc_alts_credentials_options* options,
-                                 grpc_slice target_name,
-                                 alts_tsi_event** event);
-
-/**
- * This method dispatches a ALTS TSI event received from the handshaker service,
- * and a boolean flag indicating if the event is valid to read to ALTS TSI
- * handshaker to process. It is called by TSI thread.
- *
- * - event: ALTS TSI event instance.
- * - is_ok: a boolean value indicating if the event is valid to read.
- */
-void alts_tsi_event_dispatch_to_handshaker(alts_tsi_event* event, bool is_ok);
-
-/**
- * This method destroys the ALTS TSI event.
- */
-void alts_tsi_event_destroy(alts_tsi_event* event);
-
-#endif /* GRPC_CORE_TSI_ALTS_HANDSHAKER_ALTS_TSI_EVENT_H */