11.   The affidavit said that Stayner gave details to interrogators that only the killer would know.

12.   The letter included information about the victims, like their zodiac signs, that only the killer would have known.

13.   The killer knows things about the detective that Dormer would like to keep hidden.

14.   They say the confession had details only the killer could know.

15.   They suspect that the killer knows the area well.

16.   Benedict said only the killer would know his DNA might be found at the scene.

17.   Detective Superintendent Paul Schramm said Tuesday that it appeared the victims and killers all knew each other well.

18.   Neighbors said they believed the killers may have known the victims because they accomplished their mission without messing things up.

19.   Rivard said they gave police details of the attack that only the killers could have known.

20.   So the killer knew he likely faced an office of law-abiding and unarmed victims.