( CNN ) -- A 14-year-old California boy told police he drowned his 4-year-old neighbor on Friday because the child had threatened to tell his mother the older boy had molested him , according to an affidavit made public Wednesday . Raul Renato Castro has been charged in Fresno County as an adult , with special circumstances including murder during a child molestation , sodomy , kidnapping and murder of a witness to prevent testimony , according to the district attorney 's office . He faces separate felony charges of kidnapping , sodomy and child molestation . The affidavit , filed by the Fresno County Sheriff 's Department , says Castro told investigators he lured the victim , Alex Christopher Mercato , into his apartment `` by telling the victim he had something to show him . '' Police have said no one else was in the Mendota , California , house at the time . Castro then talked the boy into entering the bathroom , according to the document . Castro said he then sodomized the child , after which `` the victim tripped over the carpet , fell , and hit the back of his head on the bathtub , '' the affidavit says . `` Castro said the victim started crying and told Castro he was going to tell his mother . Castro said he panicked and decided to kill the victim by drowning him in the bathtub . `` Castro turned on the water to the bathtub and filled it up just enough to put the victim 's face underwater and drowned him . Castro said he held the victim underwater 2-4 minutes . Castro got into the bathtub with the victim , held him down until the victim died . '' `` Castro then carried the victim over his left shoulder and put him [ in ] ... the clothes dryer to conceal him . '' The incident occurred Friday afternoon , after Mercato 's parents discovered that their child , who had been playing outside their house , was missing , Fresno County Sheriff Margaret Mims told reporters Monday . The parents called police , who searched the neighborhood and nearby parks in Mendota , 33 miles west of Fresno , she said . Soon , the FBI was called in . On Saturday , authorities resumed the search and found the body stuffed inside the dryer in the apartment next door . An autopsy determined the victim had drowned . Under California law , a 14-year-old is not eligible for the death penalty or a sentence of life without the possibility of parole . If found guilty , Castro could receive no more than 32 years to life plus 15 years .
Police say victim threatened to tell mother teen had molested him . California 14-year-old has been charged as an adult . Teen accused of molesting boy in his home for years.