This is what I found when I searched for the legal definitions under Colorado state law:
Kidnapping
130.
First degree kidnapping. Any person who does any of the following acts
with the intent thereby to force the victim or any other person to make any
concession or give up anything of value in order to secure a release of a person
under the offender's actual or apparent control commits first degree kidnapping:
18-3-301 (1)
a) Forcibly seizes and carries any person from one place to another; o(1r) (a)
b) Entices or persuades any person to go from one place to another; o(1r) (b)
c) Imprisons or forcibly secretes any person. (1) (c)
Whoever commits first degree kidnapping is guilty of a class 1 felony if the
person kidnapped shall have suffered bodily injury; but no person convicted of
first degree kidnapping shall suffer the death penalty if the person kidnapped was
liberated alive prior to the conviction of the kidnapper.
(2)
First degree kidnapping is a class 2 felony if the kidnapped person was liberated
unharmed.
18-3-301 (3)
131.
Second degree kidnapping. Second degree kidnapping is a class 2 felony if
the person kidnapped is a victim of a sexual assault or a robbery.
18-3-302 (3)
Second degree kidnapping is a class 3 felony if the kidnaping is accomplished
with intent to sell, trade, or barter the victim for consideration or does not
include sexual assault or robbery but is accomplished by the use of a deadly
weapon or any article used or fashioned in a manner to cause a person to
reasonably believe that the article is a deadly weapon or if the kidnapping is
accomplished by the perpetrator representing that he or she is armed with a
deadly weapon.
18-3-302 (4)
Any person who kidnaps a child not his own and under the age of eighteen years
of age commits a class 4 felony, if the person kidnaped is not a victim of sexual
assault or robbery, and the use of a deadly weapon is not employed.