Removing one to one optional relationships

Question

I am having some trouble removing an optional one-to-one navigation property.

In my scenario, a person has a single address. This address is optional.

After reading http://blog.bennymichielsen.be/2011/06/02/entity-framework-4-1-one-to-one-mapping/ I have modeled my domain this way:

    public class Person
    {
        public Guid Id { get; set; }
        public string Name { get; set; }
        public virtual Address Address { get; set; }
    }

    public class Address
    {
        public Guid Id { get; set; }
        public string Street { get; set; }

        [Required]
        public virtual Person Person { get; set; }
    }

    public class PersonContext : DbContext
    {
        public DbSet<Person> People { get; set; }
    }

The problem occurs when I try to remove the address from a person. The following code will fail

            using (PersonContext context = new PersonContext())
            {
                Person person = context.People.Find(personId);
                person.Address = null;
                context.SaveChanges();

                if (person.Address == null)
                {
                    Console.WriteLine("Success: Person.Address is null.");
                }
                else
                {
                    Console.WriteLine("Failure: Person.Address is not null.");
                }
            }

Both Person and Address are proxies. This will work if the address is loaded into the context somehow (eager or lazy loading).

Any help will be greatly appreciated.

Thank you