By . Louise Boyle . PUBLISHED: . 17:00 EST, 8 April 2013 . | . UPDATED: . 17:00 EST, 8 April 2013 . Aaron Schaffhausen's aunt took the stand on Monday and told the court that the killer was 'unplanned by his mom and unwanted by his dad'. Patricia Fix appeared at the trial along with Schaffhausen's mother, father and prison psychiatrist. Ms Fix also said that the family had a history of depression. Schaffhausen has admitted to killing . his three daughters - 11-year-old Amara, eight-year-old Sophie and . Cecilia, five, on July 10 last year, but claims he was not responsible . due to mental illness. Jurors will determine whether he was sane at the time of the slayings at the family's home in River Falls, Wisconsin. Aaron Schaffhausen pictured during his trial in Hudson, Wisconsin, claims he is not responsible for the murder of his three daughters due to mental illness . His father also testified during the second week of trial that Aaron was a difficult baby who did not like to be touched. Roger Schaffhausen testified that his son Aaron was a rebellious and belligerent teen who had some 'run-ins with the law'. The elder Schaffhausen says his son stole a gun, brought it to high school and was expelled. However he admitted that his son became a better person after marrying his wife Jessica and that he liked being a father to his three daughters. Roger Schaffhausen said that when his son's marriage broke down and his estranged wife began seeing someone else then he began to behave strangely and made deeply alarming remarks. According to Fox, Mr Schaffhausen senior said: 'There was one phone call received around . two o'clock in the morning. He was very despondent, depressed. Horror: Amara Schaffhausen, 11, Sophie Schaffhausen, 8, and Cecilia Schaffhausen, 5, were found dead in their home after their father cut their throats . 'Sounded . like he was always weeping. That he wanted to do terrible things to . Jess' boyfriend. He wanted to hurt the girls to show how much pain he . was in.' The murder suspect's mother Sue Allen told jurors that her son became extremely depressed when he and his wife Jessica broke up. She said that mental illness was common in other relatives. Ms Fix said that she had been deeply concerned that Schaffhausen was going to harm his daughters when he made phone calls to her. Dr Ralph Baker, a prison psychiatrist, also took the stand. He explained that while Shaffhausen was depressed, he did not appear to have a mental condition that would legally support an insanity defense. Baker says Schaffhausen told him what happened at the house was a 'spur of the moment thing'. Schaffhausen told Baker he tried to help Cecilia find her shoes, and the next thing he knew, he had his hands on her neck and was strangling her before then slitting his three daughters' throats. Charged: Aaron Schaffhausen, 34, of Minot, North Dakota, faces three counts of first-degree intentional homicide - each a mandatory life sentence if convicted for stabbing his three daughters to death .
Trial to decide if Schaffhausen, 35, was .
sane when he killed his three daughters - 11-year-old Amara, 8-year-old .
Sophie and 5-year-old Cecilia .
Suspect's aunt Patricia Fix made remarks to Wisconsin court on Tuesday .
By . Louise Boyle . PUBLISHED: . 17:00 EST, 8 April 2013 . | . UPDATED: . 17:00 EST, 8 April 2013 . Aaron Schaffhausen's aunt took the stand on Monday and told the court that the killer was 'unplanned by his mom and unwanted by his dad'. Patricia Fix appeared at the trial along with Schaffhausen's mother, father and prison psychiatrist. Ms Fix also said that the family had a history of depression. Schaffhausen has admitted to killing . his three daughters - 11-year-old Amara, eight-year-old Sophie and . Cecilia, five, on July 10 last year, but claims he was not responsible . due to mental illness. Jurors will determine whether he was sane at the time of the slayings at the family's home in River Falls, Wisconsin. Aaron Schaffhausen pictured during his trial in Hudson, Wisconsin, claims he is not responsible for the murder of his three daughters due to mental illness . His father also testified during the second week of trial that Aaron was a difficult baby who did not like to be touched. Roger Schaffhausen testified that his son Aaron was a rebellious and belligerent teen who had some 'run-ins with the law'. The elder Schaffhausen says his son stole a gun, brought it to high school and was expelled. However he admitted that his son became a better person after marrying his wife Jessica and that he liked being a father to his three daughters. Roger Schaffhausen said that when his son's marriage broke down and his estranged wife began seeing someone else then he began to behave strangely and made deeply alarming remarks. According to Fox, Mr Schaffhausen senior said: 'There was one phone call received around . two o'clock in the morning. He was very despondent, depressed. Horror: Amara Schaffhausen, 11, Sophie Schaffhausen, 8, and Cecilia Schaffhausen, 5, were found dead in their home after their father cut their throats . 'Sounded . like he was always weeping. That he wanted to do terrible things to . Jess' boyfriend. He wanted to hurt the girls to show how much pain he . was in.' The murder suspect's mother Sue Allen told jurors that her son became extremely depressed when he and his wife Jessica broke up. She said that mental illness was common in other relatives. Ms Fix said that she had been deeply concerned that Schaffhausen was going to harm his daughters when he made phone calls to her. Dr Ralph Baker, a prison psychiatrist, also took the stand. He explained that while Shaffhausen was depressed, he did not appear to have a mental condition that would legally support an insanity defense. Baker says Schaffhausen told him what happened at the house was a 'spur of the moment thing'. Schaffhausen told Baker he tried to help Cecilia find her shoes, and the next thing he knew, he had his hands on her neck and was strangling her before then slitting his three daughters' throats. Charged: Aaron Schaffhausen, 34, of Minot, North Dakota, faces three counts of first-degree intentional homicide - each a mandatory life sentence if convicted for stabbing his three daughters to death .
Patricia Fix appeared at the trial along with 11-year-old Amara, eight-year-old Sophie and . Jurors will determine whether he was sane at the strangely and made deeply alarming remarks. Schaffhausen, 8, and Cecilia Schaffhausen, 5, his three daughters to death .