LOWELL -- A Level 3 sex offender from Lowell has been sentenced to at least four years in state prison after he was found guilty in July of assaulting his ex-girlfriend by punching, choking and biting her, an attack that ended when the victim's 13-year-old daughter walked into the room, according to prosecutors.
Robert Sigman, 40, of Lowell, was found guilty by a Lowell Superior Court jury on July 18 of assault and battery causing serious bodily injury, assault and battery, and threatening to commit a crime in the December 2012 assault. He was found not guilty of kidnapping. Sentencing was postponed until July 28.
At a hearing Monday, Judge Mary Ames sentenced Sigman to four years and 364 days up to five years in state prison with 585 days of jail credit. After he is released from prison, Sigman will be on probation for five years. While on probation, Sigman must comply with certain conditions, including: complete a batterers program, stay away from the victim, no alcohol, maintain employment and be evaluated and seek treatment, if necessary, for anger management.
Sigman, through his attorney, has filed an appeal.
Prosecutors allege that on Dec. 17, 2012, Sigman, who had been drinking, tried to enter his ex-girlfriend's house. When she refused to let him in, he pushed his way into the apartment and began to attack her. He forced the victim into her bedroom and threw her on the bed. Over the course of several hours he punched and choked her, broke her tooth, bit her and threatened to kill her.
The victim was transported to the hospital where she was diagnosed with a fracture to her tailbone and lacerations and abrasions.
Sigman has a 1994 conviction for raping and molesting a child under 14. He also pleaded guilty that year to indecent assault and battery on a person over 14, and assault and battery with a dangerous weapon. He was sentenced to four years and one month in state prison.