question:By . Daily Mail Reporter . PUBLISHED: . 19:42 EST, 29 November 2013 . | . UPDATED: . 19:50 EST, 29 November 2013 . A California man who was awaiting trial over the murder of six people, including four homeless men, died on Thursday after ingesting cleaning product in his jail cell. Itzcoatl Ocampo, 25, apparently accumulated the cleaning product during his time in custody, and is believed to have swallowed it on Wednesday, his attorney, Michael Molfetta, said. The death raises questions about how well Orange County jail deputies were supervising Ocampo, who had mental health issues, Mr Molfetta said. Dead: Itzcoatl Ocampo died in hospital after being found shaking and vomiting in his prison cell . The former Marine was taken to hospital on Wednesday after being found shaking and vomiting in his cell, Orange County sheriff's Lieutenant Jeff Hallock said. No cause of death was immediately given, and officials said a post-mortem examination will be performed in the coming days. Suspect: Former marine Ocampo was accused of murdering four homeless men . The Orange County district attorney's office will investigate the death, and post-mortem examination results by an independent pathologist are expected by the middle of next week, Lieutenant Hallock said. 'If you spend three minutes with Ocampo, you are acutely aware of the fact that he has some mental issues. They were severe and they were obvious and they definitely were not contrived,' Mr Molfetta said. 'With that being said, this was a guy who should have garnered the highest level of scrutiny ... and it wasn't done.' Lieutenant Hallock declined to comment on inmate supervision or the attorney's account, except to say jail deputies are required, in general, to walk by each inmate's cell a minimum of once an hour. 'We always want to prove the case in court and have justice for the victims' families,' Susan Kang Schroeder, the district attorney's chief of staff, said. Marie Middaugh, the mother of one of the victims, said in a phone interview on Friday that she was relieved to hear of Ocampo's death. 'A trial wouldn't have brought our loved ones back,' said Ms Middaugh, whose son Lloyd 'Jimmy' Middaugh, was murdered. 'I'm sorry things happened the way it did for his family because I know they're grieving, too, but I'm just glad that really it's all over.' Someone at a number listed for Ocampo's father hung up repeatedly when a reporter from AP called Friday. Prosecutors alleged that Ocampo, a native of Mexico, stabbed four homeless men in what they called a serial thrill-kill rampage in late 2011 and early 2012. Ocampo allegedly targeted his homeless victims because they were vulnerable and because he felt they were a blight on the community, authorities said. He was charged in January 2012 with four counts of murder, with special allegations of multiple murders, lying in wait and use of a deadly weapon. Victims: James McGillivray, left, and Lloyd 'Jimmy' Middaugh, right, were the first victims in the killing spree . Stabbed: Paulus 'Dutch' Smit, left, and John Berry, right, were among the homeless men murdered in LA . Three victims were stabbed more than 40 times each with a single-edged blade at least 7in long. In one instance, prosecutors, said, Ocampo selected as his next victim a homeless man who was featured in a Los Angeles Times story about the killings. Ocampo, who was discharged from the Marines in 2010, was also facing murder charges in the deaths of a school friend's mother and brother in October 2011. At the time, his family said Ocampo was a troubled man after he returned from Iraq in 2008 and he went to visit the grave of a friend who died in combat in Afghanistan twice a week. He also began drinking heavily and suffered from headaches and hand tremors, they said. His parents separated in 2010 and his father became homeless after losing his job. During the killing rampage, Ocampo visited his father on the streets and warned him about the dangers of being homeless, even showing him a picture of one of the dead men. In March 2012, Ocampo was placed temporarily on suicide watch after he began banging his head on a metal toilet in the jail. He told his attorney he was trying to stop voices as well as headaches and twitches that were bothering him, according to The Orange County Register.

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question:Find the smallest solution to the equation [frac{3x}{x-3} + frac{3x^2 - 27}{x} = 15.]