CARTHAGE, N.C. – Authorities worked yesterday to unravel the mystery of why a 45-year-old painter tore through a North Carolina nursing home on a terrifying rampage that left eight dead, releasing few details but saying the shooting spree wasn’t a ‘random act of violence.’ One possible clue: the gunman’s estranged wife works at Pinelake Health and Rehab, where authorities say Robert Stewart shot and killed seven residents – most in their late 80s – and a nurse who cared for them. ‘We’re certainly looking into the fact that it may be domestic-related,’ said Carthage Police Chief Chris McKenzie. Moore County prosecutor Maureen Krueger said detectives were still gathering information on what could have set off Stewart. ‘The information on motive is incompete at this time,’ she said, adding: ‘This was not a random act of violence. There is only one suspect and he is in custody.’ McKenzie said yesterday he believed the couple were recently separated, but acknowledged he didn’t yet know many more details about her. A neighbor said Stewart’s estranged wife is a certified nurse assistant at the nursing home named Wanda Luck, and public records indicate she shared an address with Stewart in Carthage. Several telephone numbers for Luck or her family were disconnected. A knock at the door was unanswered at Luck’s address. ‘This is a horrible tragedy,’ said Mark Barnett, the neighbor. ‘This is something that’s just unthinkable. I can’t even imagine what she’s going through.’ Another ex-wife of Stewart’s, Sue Griffin, told reporters Sunday she had not had contact with him since they divorced in 2001, but said he had been recently reaching out to family members, telling them he had cancer and was preparing for a long trip and to ‘go away.’ Griffin added she didn’t know how her ex-husband was connected to the nursing home or why he would shoot people there. ‘He did have some violent tendencies from time to time,’ Griffin said. ‘I wouldn’t put it past him. I hate to say it, but it is true.’ Authorities said the attack began around 10 a.m. Sunday, when Stewart arrived at the nursing home and care center for patients with Alzheimer’s disease and started firing. McKenzie said he was armed with more than one weapon, and witnesses said he was shooting a ‘deer gun.’ Police recovered a camouflaged-colored rifle or shotgun from the home’s parking lot, where at least two cars had their windows shattered, apparently by gunfire. The shooting spree was ended by 25-year-old Officer Justin Garner, who entered the nursing home alone as he responded to a 911 call. McKenzie said Garner, a training officer with more than four years on the Carthage force and a past winner of the department’s officer of the year award, knew he was headed into a perilous situation, but didn’t wait for back-up or a SWAT team to arrive. ‘If that’s not heroism, I don’t know what is,’ McKenzie said. ‘He had to go to all the way through the facility to encounter this individual,’ McKenzie said. ‘It would be hard for me to believe he didn’t (hear gunfire).’ Stewart wounded Garner three times in the leg as they traded gunfire in a hallway of the 110-bed facility, McKenzie said. The single shot Garner fired from his .40-caliber service pistol hit Stewart in the chest. ‘Whether he realizes it now, he will hopefully realize someday how many lives he has saved,’ McKenzie said, adding: ‘A lot more lives would have been lost, I honestly feel, had he not done what he did. For certain.’ Stewart is not scheduled to appear in court until next week on eight counts of first-degree murder and a charge of felony assault of a law enforcement officer. McKenzie said he did not know if Stewart had an attorney. McKenzie was unaware of any criminal activity in Stewart’s past, and records in Moore County show the only charges on his record stem from a drunken-driving case in 1988. He was involved in a few minor civil complaints, including a 2002 order that he surrender $1,103 after a woman complained his painting business failed at repainting some wrought iron furniture. Detectives were working at the state medical examiner’s office in Chapel Hill on yesterday to recover evidence, and search warrants police executed in the hours after the shooting were sealed. Court records said Stewart was transferred from the custody of the Moore County Sheriff to the state Department of Correction, because he has a gunshot wound. Authorities identified the victims as Pinelake residents Tessie Garner, 88; Lillian Dunn, 89; Jessie Musser, 88; Bessie Hendrick, 78; John Goldston, 78; Margaret Johnson, 89; Louise Decker, 98; and nurse Jerry Avent, whose age wasn’t immediately available. Musser had lived at Pinelake for only six weeks, said his son-in-law, Jim Foster, 47, of Aberdeen. He said the man had Alzheimer’s and Parkinson’s diseases and was blind, deaf and confined to a wheelchair. Foster said the family was now trying to figure out how to tell Musser’s wife, who has dementia and lives at the same facility, that her husband is dead. ‘She was upset that they didn’t bring him to see her yesterday,’ Foster said. ‘I don’t know how we’re going to break it to her. You got a clue?’ Sunday’s rampage in North Carolina’s Sandhills region, about 60 miles southwest of Raleigh, happened just weeks after a man killed 10 people, including his mother and several other relatives, in the worst mass shooting in Alabama’s history on March 10. On March 11, a teen killed 12 people at his former high school in Germany.