A New York man who said a sleeping aid caused him to fatally strangle his girlfriend has been sentenced to serve between 20 years and life in prison.

Rockland County prosecutors say 38-year-old Nixon Bourguignon was sentenced Friday on a murder charge in connection with the death of Shannon Coleman, the mother of his child.

Authorities say Coleman was killed inside her home in Garnerville in May 2014. Rockland County District Attorney Thomas Zugibe says Bourguignon killed Coleman after she broke off their relationship.

Bourguignon's attorney had argued at his trial the sleeping aid Ambien caused him to become violent and he didn't remember the killing.

The Journal News reports (http://lohud.us/1PZX4QS ) defense attorney David Goldstein says he believes the jury erred in convicting Bourguignon.


Information from: The Journal News, http://www.lohud.com