One of Hong Kong’s most notorious killers — an American expat dubbed the “Milkshake Murderer”– was back in court this week with a bid to get her life sentence reduced. Nancy Kissel earned her nickname in 2003, when she killed hubby Robert Kissel, a senior executive for Merrill Lynch, in their Hong Kong apartment — bludgeoning him to death after serving him a strawberry milkshake spiked with sedatives. After a dramatic, well-publicized trial, Kissel, now 51, was convicted of murder in 2005 and sentenced to life in prison at Hong Kong’s maximum security Tai Lam Centre for Women.