@since: BuddyPress 2.7.0 The $user_id parameter was added.
Description
bp_messages_thread_before_mark_delete

Fires before a message thread is marked as deleted.

Source: bp-messages/classes/class-bp-messages-thread.php:661

bp_messages_thread_after_delete

Fires before an entire message thread is deleted.

Source: bp-messages/classes/class-bp-messages-thread.php:789

messages_before_delete_thread

Fires before specified thread IDs have been deleted.

Source: bp-messages/bp-messages-functions.php:396

messages_delete_thread

Fires after specified thread IDs have been deleted.

Source: bp-messages/bp-messages-functions.php:419