hi, i had seen that in the kander and ebb version of the kiss of the spider woman the main character kills with a kiss.
Here is where i found the information:
http://tvtropes.org/pmwiki/pmwiki.php/Main/KissOfDeath in the theater section
http://en.wikipedia.org/wiki/Kiss_of_the_Spider_Woman_(musical) in the plot.
i wish good luck if you search it :-)