( CNN ) -- Josef Fritzl , the Austrian accused of keeping his daughter in a cellar for decades and fathering her seven children , will plead guilty to rape and incest when his trial opens Monday , Fritzl 's lawyer told CNN . Josef Fritzl is expected to plead guilty to rape and incest on Monday , his lawyer tells CNN . However , Fritzl will deny other charge he faces : murder , enslavement and assault , attorney Rudolph Mayer said Sunday . The 73-year-old expects to spend the rest of his life in prison , Mayer added . Fritzl faces six charges in a closed-door trial . The trial is scheduled to last five days , but Mayer said it could be shorter . Fritzl was charged in November with incest and the repeated rape of his daughter , Elisabeth , over a 24-year period . But he was also charged with the murder of one of the children he fathered with her , an infant who died soon after birth . State Prosecutor Gerhard Sedlacek said Michael Fritzl died from lack of medical care . In all , Fritzl is charged with : murder , involvement in slave trade ( slavery ) , rape , incest , assault and deprivation of liberty , Sedlacek 's office said . If convicted , he could face life in prison . Austria does not have the death penalty . `` This man obviously led a double life for 24 years . He had a wife and had seven kids with her . And then he had another family with his daughter , fathered another seven children with her , '' said Franz Polzer , a police officer in Amstetten , the town where Fritzl lived , at the time of his arrest . The case first came to light in April 2008 when Elisabeth 's daughter , Kerstin , became seriously ill with convulsions . Elisabeth persuaded her father to allow Kerstin , then 19 , to be taken to a hospital for treatment . Hospital staff became suspicious of the case and alerted police , who discovered the family members in the cellar . Fritzl confessed to police that he raped his daughter , kept her and their children in captivity and burned the body of the dead infant in an oven in the house . Elisabeth told police the infant was one of twins who died a few days after birth . When Elisabeth gained her freedom , she told police her father began sexually abusing her at age 11 . On August 8 , 1984 , she told police , her father enticed her into the basement , where he drugged her , put her in handcuffs and locked her in a room . Fritzl explained Elisabeth 's disappearance in 1984 by saying the girl , who was then 18 , had run away from home . He backed up the story with letters he forced Elisabeth to write . Elisabeth Fritzl and all but three of her children lived in the specially designed cellar beneath her father 's home in Amstetten , Austria , west of Vienna . The other three children lived upstairs with Fritzl and his wife ; Fritzl had left them on his own doorstep , pretending the missing Elisabeth had dropped them off . Under Austrian law , if Fritzl is convicted on several offenses , he will be given the sentence linked to the worst crime . The charges he faces are : . • Murder : The infant who died in 1996 died from a lack of medical care , the state prosecutor said . The charge carries a sentence of life in prison . • Involvement in slave trade : From 1984 until 2008 , prosecutors allege , Fritzl held his daughter , Elisabeth , captive in a dungeon , abused her sexually and treated her as if she were his personal property -- in a situation similar to slavery . If he is convicted , the sentence could range from 10 to 20 years in prison . • Rape : Between August 30 , 1984 , and June 30 , 1989 , Fritzl `` regularly sexually abused Elisabeth , '' according to the prosecutor . The sentence could be from five to 15 years in prison . • Incest : Parallel to the rape charge . It carries a sentence of up to one year . • Withdrawal of liberty : Three of the children Fritzl had with Elisabeth were illegally held captive in a dungeon with no daylight or fresh air , according to prosecutors . That charge carries a sentence of one to 10 years . • Assault : Between August 28 , 1984 , and April 26 , 2006 , Fritzl repeatedly threatened Elisabeth and their three children with gas and booby traps as warnings in case they tried to escape , authorities allege . The sentence would range from six months to five years . CNN 's Frederik Pleitgen and Melissa Gray contributed to this report .
Man accused of keeping daughter in a cellar for decades , fathering her 7 children . Josef Fritzl , whose trial starts Monday , will plead guilty , his lawyer tells CNN . Prosecutors : Fritzl raped his daughter over 24 years , said she had run away . Score: 6