Alexa might have been listening, as she almost always is, when Christine Sullivan was stabbed to death in the kitchen of the Farmington, New Hampshire, home where Sullivan lived with her boyfriend on the night of Jan. 27, 2017. But does Alexa remember any of it? That’s the question state prosecutors are hoping will produce key evidence in the murder case against Timothy Verrill, who is accused of killing Sullivan and her friend, Jenna Pelligrini, over suspicions they were informing police about an alleged drug operation.