A New Hampshire man charged with killing his former wife is being held without bail. Prosecutors have charged Aaron Desjardins, 36, of Epping with first-degree murder in the death of Amanda Warf, whose body was found in a vacant concrete plant last week. Her neck artery was severed. The shackled Desjardins was arraigned in a brief court appearance in Seabrook on Wednesday. Police searched his house over the weekend, and he told reporters that he had nothing to do with his former wife’s death. The couple divorced in February 2012. They have a 1-year-old son.