On Sept. 22, Kenneth Robson, 68, pleaded guilty to one count of murder in the second degree. The defendant was subsequently sentenced to 25 years to life in prison, according to a press release issued by the Hampden County District Attorney's Office. Robson was initially arrested and charged with armed assault with intent to murder – and once Holmes died, his charges were upgraded. In 1984, he was convicted of murdering his then-wife Joan Cusson, a crime that left lasting wounds on her family. With today's sentence, he will spend the remainder of his life in prison and will never again have the opportunity to harm another person."