A few days ago, there was a tremendous tragedy in Chile, a massive earthquake. Google put together a tool to help family and friends locate missing people due to this earthquake. The tool is located at http://chilepersonfinder.appspot.com/.
At this tool, you can either submit a case of a missing person or search for a case of a missing person. There are currently about 35,700 records, or missing people in the database, some accounted for and some not.
Two people asked how they can remove a person they added to the list, after that person has been found? The thread of these questions are at a Google Webmaster Help thread. The people ask:
I would also like to know how to delete my personal information now that my person has been found, even if the profile remains up.
John from Google said you can update the status in the application under "Status of this person" and set it to perhaps "I have received information that this person is alive" and provide the information that you have. But that is not exactly what these people want to do, they want to delete their personal information, as the person who submitted the information.
I'll check with the team to see what can be done in a situation like that.
So far, there is not update on how to do that.
Forum discussion at Google Webmaster Help.
Update: Jaime from the Google Web Search team posted in a Google Web Search Help forums a link to a spreadsheet form where users can request their info to be deleted from the finder. The link is to this form.