NEW YORK - The gunman who killed six Sikh worshippers in a Wisconsin temple Sunday ended his rampage with a self-inflicted gunshot to the head, according to media report Wednesday, citing FBI.FBI Special Agent in Charge Teresa Carlson told a Wednesday news conference that investigators also have not yet “clearly defined a motive” for Sunday shooting reportedly by Wade Michael Page, an army veteran and a white supremacist.Page, 40, turned his 9mm semi-automatic handgun on himself after being shot in the stomach by a police officer who responded to the scene in Oak Creek, Wisconsin. Authorities had previously had said Page was killed with a rifle shot from an Oak Creek police officer after he refused to put down his weapon and fired at the officer. Carlson, special agent in charge of the FBI in Milwaukee, said investigators reviewed videotape that showed Page died of a self-inflicted gunshot wound to the head.Page was leader of a band that spewed hateful lyrics, but no clear motive for Sunday’s assault has emerged. Witnesses say the life of Page, who was drummed out of the Army in 1999 for drinking and lost a job, later, for being drunk, spiralled after a recent breakup with his live-in girlfriend.Carlson said there is no surveillance video from inside the temple because cameras were not turned on. But she said investigators have reviewed other surveillance tape and conducted searches of Page’s home, a storage locker he owned and his last place of employment.Page’s bloody spree claimed Sita Singh, 41; Ranjit Singh, 49; Satwant Singh Kaleka, 65; Prakash Singh, 39; Paramjit Kaur, 41; and Suveg Singh, 84 as victims. Four more were injured, including 51-year-old veteran police Lt. Brian Murphy. Authorities said Murphy, who was ambushed by Page as he tried to help a victim, is recovering and now able to walk.Carlson said authorities have not evidence to suggest there was anyone else involved in the shooting other than page and called the investigation ongoing. Police did arrest Page’s ex-girlfriend, Misty Cook, Tuesday night on a weapons charge. Cook, 31, a nursing student and reported white supremacist, was found in possession of a gun during a search of her home following the shooting. As a convicted felon, she is not allowed to possess a firearm, according to authorities.