On January 27, 2001, Dartmouth College professors Half and Susanne Zantop, aged 62 and 55 respectively, were stabbed to death at their home in Etna, New Hampshire. Originally from Germany, the couple had been teaching at Dartmouth since the 1970s. High school classmates James J. Parker, age 16, and Robert W. Tulloch, age 17, were charged with first-degree murder. Parker pleaded guilty to second-degree murder in exchange for testifying against Tulloch, and was sentenced to 25 to life. Tulloch pleaded guilty to first-degree murder and received the mandatory sentence of life imprisonment without parole. In 2014 the New Hampshire Supreme Court ordered Tulloch's sentence reviewed. Half and Susanne Zantop Half Zantop met Susanne Korsukewitz while they were both studying at Stanford University in the mid-1960s. They were both from Germany. Fascinated with geology, Half had earned a bachelor's degree from Freiburg University, while Susanne was working on her master's degree in political science. After Half earned a Ph.D. in geology in 1969 at Stanford and worked as a field geologist, he and Susanne were married in 1970. They had two daughters, Veronika and Mariana. Susanne taught in the German department at Dartmouth College and was chair of that faculty. Half taught geology and earth science, and was popular among many of his students. In 2000, they had begun discussing retirement in the near future. The murders Tulloch and Parker went to the Zantop residence on the morning of January 27, 2001. Posing as students doing research for a school survey, they intended to take the occupants by surprise, threaten them into revealing their PINs, and rob and kill them. Half allowed them inside while Susanne was preparing a dish for a dinner she was hosting that evening at home. According to his confession, Parker said that Zantop was "an alright guy" and that they did not need to kill him. Tulloch allegedly became angered when Zantop, a professor of earth science, told him that he had to come more prepared (for questions for the purported research). Tulloch resented the comments and attacked Zantop when he turned away to look for a phone number. Tulloch took his SOG Knife and repeatedly stabbed Half in the chest and face, cutting his own leg accidentally in the process. When Susanne came from the kitchen and tried to stop him, Parker stabbed and injured her, allegedly at Tulloch's orders. Tulloch also stabbed her in