bp_get_the_thread_message_sender_name()

	function bp_get_the_thread_message_sender_name() {
		global $thread_template;

		$display_name = bp_core_get_user_displayname( $thread_template->message->sender_id );

		if ( empty( $display_name ) ) {
			$display_name = __( 'Deleted User', 'buddyboss' );
		}

		/**
		 * Filters the display name of the sender of the current message.
		 *
		 * @since BuddyPress 1.1.0
		 *
		 * @param string $display_name Display name of the sender of the current message.
		 */
		return apply_filters( 'bp_get_the_thread_message_sender_name', $display_name );
	}