I found this interesting. It was written by an author, not a ME or a LE officer, but describes the mark on JonBenet's neck, as occurring with hanging. Just thought I would post it, to see what you experts have to say!! I have always heard the mark was there due to strangulation by a 'soft' object first.
hanging or strangulation:
While accidental hanging is rare, and homicidal hanging is even rarer, hanging is the third most common form of suicide and accounts for 16% of all male, and 13% of all female suicides. Most people who commit suicide by hanging, jump from a chair or a ladder, choking to death slowly. Rarely is the neck broken. In order to break a neck, a drop of six feet or more is required, which rarely happens except in execution hanging.
Hanging, whether done with rope, an electrical cord or a belt, always leaves an inverted V bruise, and is easy to tell from ligature strangulation (murder), which leaves a straight-line bruise. Hanging compresses the veins, but arterial blood flow continues, causing small bleeding sites on the lips, inside the mouth and on the eyelids. As with ligature strangulation, the face and neck are congested with blood and become dark red.
Ligature strangulations are almost always homicide and the victims are almost always women. Often the murderer uses more force than necessary to kill the victim, causing deep bruises and abrasions around the neck. The victim will usually struggle, which results in damage to both the interior and exterior structures of the neck and throat.
http://www.writing-world.com/mystery/suicide.shtml
hanging or strangulation:
While accidental hanging is rare, and homicidal hanging is even rarer, hanging is the third most common form of suicide and accounts for 16% of all male, and 13% of all female suicides. Most people who commit suicide by hanging, jump from a chair or a ladder, choking to death slowly. Rarely is the neck broken. In order to break a neck, a drop of six feet or more is required, which rarely happens except in execution hanging.
Hanging, whether done with rope, an electrical cord or a belt, always leaves an inverted V bruise, and is easy to tell from ligature strangulation (murder), which leaves a straight-line bruise. Hanging compresses the veins, but arterial blood flow continues, causing small bleeding sites on the lips, inside the mouth and on the eyelids. As with ligature strangulation, the face and neck are congested with blood and become dark red.
Ligature strangulations are almost always homicide and the victims are almost always women. Often the murderer uses more force than necessary to kill the victim, causing deep bruises and abrasions around the neck. The victim will usually struggle, which results in damage to both the interior and exterior structures of the neck and throat.
http://www.writing-world.com/mystery/suicide.shtml