An Arizona man who pled guilty to the murder of his 2-year-old daughter died the night before he was set to turn himself in to authorities ahead of sentencing ... TMZ has learned. Christopher Scholtes ' November 4 death is being investigated as a suicide, the Maricopa County Medical Examiner in Phoenix confirms to TMZ. Law enforcement sources tell TMZ ... authorities are looking at carbon monoxide poisoning as a possible cause of death ... but the Maricopa County Medical Examiner will make the