Elizabeth van Valkenburg

Killed husband.  Confession goes on and on about how he drank 
and abused her (but he was her second husb/victim).  Both 
husbands drank, both were poisoned by arsenic in their booze.

http://www.vanvalkenburg.org (family site).

http://www.vanvalkenburg.org/liz-confess.html

http://www.vanvalkenburg.org/liz-sentence.html