Delete's a friend from a user's selected friends list. 

This method can be accessed through the Friends.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/Friends.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "DeleteSelectedFriend", Description = "Delete's a friend from a user's selected friends list.")]
public void DeleteSelectedFriend(long selectedFriendUserId, long userId);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "DeleteSelectedFriend", Description = "Delete's a friend from a user's selected friends list.")>
Public Function DeleteSelectedFriend(selectedFriendUserId As long, userId As long) As void