diff --git a/packages/account-tree-controller/src/AccountTreeController.test.ts b/packages/account-tree-controller/src/AccountTreeController.test.ts
index 235c9a780aa..4d9937dd3fc 100644
--- a/packages/account-tree-controller/src/AccountTreeController.test.ts
+++ b/packages/account-tree-controller/src/AccountTreeController.test.ts
@@ -1656,24 +1656,6 @@ describe('AccountTreeController', () => {
       expect(controller.getSelectedAccountGroup()).not.toBe('');
     });
 
-    it('updates selectedAccountGroup when AccountsController selected account changes', () => {
-      const { controller, messenger } = setup({
-        accounts: [MOCK_HD_ACCOUNT_1, MOCK_HD_ACCOUNT_2],
-        keyrings: [MOCK_HD_KEYRING_1, MOCK_HD_KEYRING_2],
-      });
-
-      controller.init();
-      const initialGroup = controller.getSelectedAccountGroup();
-
-      messenger.publish(
-        'AccountsController:selectedAccountChange',
-        MOCK_HD_ACCOUNT_2,
-      );
-
-      const newGroup = controller.getSelectedAccountGroup();
-      expect(newGroup).not.toBe(initialGroup);
-    });
-
     it('updates AccountsController selected account (with EVM account) when selectedAccountGroup changes', () => {
       const { controller, messenger } = setup({
         accounts: [MOCK_HD_ACCOUNT_1, MOCK_HD_ACCOUNT_2],
@@ -1819,28 +1801,6 @@ describe('AccountTreeController', () => {
       }).toThrow('No accounts found in group: non-existent-group-id');
     });
 
-    it('handles AccountsController selectedAccountChange for account not in tree gracefully', () => {
-      const { controller, messenger } = setup({
-        accounts: [MOCK_HD_ACCOUNT_1],
-        keyrings: [MOCK_HD_KEYRING_1],
-      });
-
-      controller.init();
-      const initialGroup = controller.getSelectedAccountGroup();
-
-      const unknownAccount: InternalAccount = {
-        ...MOCK_HD_ACCOUNT_2,
-        id: 'unknown-account-id',
-      };
-
-      messenger.publish(
-        'AccountsController:selectedAccountChange',
-        unknownAccount,
-      );
-
-      expect(controller.getSelectedAccountGroup()).toBe(initialGroup);
-    });
-
     it('falls back to first wallet first group when AccountsController returns EMPTY_ACCOUNT', () => {
       const { controller, messenger } = setup({
         accounts: [MOCK_HD_ACCOUNT_1, MOCK_HD_ACCOUNT_2],
@@ -3666,41 +3626,6 @@ describe('AccountTreeController', () => {
       expect(selectedAccountGroupChangeListener).toHaveBeenCalledTimes(1);
     });
 
-    it('emits selectedAccountGroupChange when selected account changes via AccountsController', () => {
-      // Use different keyring types to ensure different groups
-      const { controller, messenger } = setup({
-        accounts: [MOCK_HD_ACCOUNT_1, MOCK_SNAP_ACCOUNT_1],
-        keyrings: [MOCK_HD_KEYRING_1, MOCK_HD_KEYRING_2],
-      });
-
-      const selectedAccountGroupChangeListener = jest.fn();
-      messenger.subscribe(
-        'AccountTreeController:selectedAccountGroupChange',
-        selectedAccountGroupChangeListener,
-      );
-
-      controller.init();
-
-      const initialSelectedGroup =
-        controller.state.accountTree.selectedAccountGroup;
-
-      jest.clearAllMocks();
-
-      messenger.publish(
-        'AccountsController:selectedAccountChange',
-        MOCK_SNAP_ACCOUNT_1,
-      );
-
-      const newSelectedGroup =
-        controller.state.accountTree.selectedAccountGroup;
-
-      expect(selectedAccountGroupChangeListener).toHaveBeenCalledWith(
-        newSelectedGroup,
-        initialSelectedGroup,
-      );
-      expect(selectedAccountGroupChangeListener).toHaveBeenCalledTimes(1);
-    });
-
     it('does NOT emit selectedAccountGroupChange when the same account group is already selected', () => {
       const { controller, messenger } = setup({
         accounts: [MOCK_HD_ACCOUNT_1],
diff --git a/packages/account-tree-controller/src/AccountTreeController.ts b/packages/account-tree-controller/src/AccountTreeController.ts
index e9eee3941c4..1ad4861b313 100644
--- a/packages/account-tree-controller/src/AccountTreeController.ts
+++ b/packages/account-tree-controller/src/AccountTreeController.ts
@@ -217,13 +217,6 @@ export class AccountTreeController extends BaseController<
       },
     );
 
-    this.messagingSystem.subscribe(
-      'AccountsController:selectedAccountChange',
-      (account) => {
-        this.#handleSelectedAccountChange(account);
-      },
-    );
-
     this.messagingSystem.subscribe(
       'UserStorageController:stateChange',
       (userStorageControllerState) => {
@@ -1045,39 +1038,6 @@ export class AccountTreeController extends BaseController<
     return this.#getDefaultAccountGroupId(wallets);
   }
 
-  /**
-   * Handles selected account change from AccountsController.
-   * Updates selectedAccountGroup to match the selected account.
-   *
-   * @param account - The newly selected account.
-   */
-  #handleSelectedAccountChange(account: InternalAccount): void {
-    const accountMapping = this.#accountIdToContext.get(account.id);
-    if (!accountMapping) {
-      // Account not in tree yet, might be during initialization
-      return;
-    }
-
-    const { groupId } = accountMapping;
-    const previousSelectedAccountGroup =
-      this.state.accountTree.selectedAccountGroup;
-
-    // Idempotent check - if the same group is already selected, do nothing
-    if (previousSelectedAccountGroup === groupId) {
-      return;
-    }
-
-    // Update selectedAccountGroup to match the selected account
-    this.update((state) => {
-      state.accountTree.selectedAccountGroup = groupId;
-    });
-    this.messagingSystem.publish(
-      `${controllerName}:selectedAccountGroupChange`,
-      groupId,
-      previousSelectedAccountGroup,
-    );
-  }
-
   /**
    * Handles multichain account wallet status change from
    * the MultichainAccountService.