SEAL BEACH, Calif. (AP) — The ex-wife of the man suspected of killing eight people in a shooting rampage at a hair salon claimed in court papers filed this year he was mentally unstable and had threatened to kill himself or someone else at least once.Michelle Fournier Dekraai made the allegations in May in a filing related to her long-running, bitter custody battle with Scott Dekraai over their 7-year-old son. There was no sign she had filed a restraining order.Police say Scott Dekraai opened fire in the salon where his ex-wife worked Wednesday afternoon, a day after he was in court for a hearing related to the custody dispute.Police have not released information about the victims and it's unclear if Dekraai's ex-wife is among them, but witnesses say she was at the Meritage Salon when the gunman barged in and began shooting.The couple divorced in 2007, and Scott Dekraai remarried, but the battle over their son continued to rage. Michelle Fournier Dekraai wrote in the court papers that her ex-husband was "almost manic when it comes to demanding absolute right to control our son and make unilateral decisions."She wrote that giving Scott Dekraai more custody of their child would be lead to "a situation where the inmates are running the asylum."She also wrote her ex-husband had been physically abusive to her during their marriage, and that in 2008 he beat his stepfather, pleaded guilty to assault and battery and underwent a year of anger management.A temporary restraining order obtained by Scott Dekraai's stepfather in 2007 said Dekraai attacked him that year, leaving him with cuts and bruises on his face and right arm.