( CNN ) -- A judge will determine this week whether there 's enough evidence to keep in jail a Georgia man whose son died in a hot SUV . Justin Ross Harris , who is charged with murder and second-degree child cruelty , will go before a judge Thursday for a probable cause hearing . Police say Harris left his 22-month-old son , Cooper , strapped into a car seat under a baking sun for seven hours while he went to work . The boy died , and Harris sits in jail without bail . He has pleaded not guilty . At a probable cause hearing , the prosecution tries to convince the judge that a crime has been committed and the defendant committed it . Internet searches . Among the tidbits police have released about the case is that Harris and his wife , Leanna , told them that they conducted Internet searches on how hot a car needed to get to kill a child . `` During an interview with Justin , he stated that he recently researched , through the Internet , child deaths inside vehicles and what temperature it needs to be for that to occur , '' police said . `` Justin stated that he was fearful that this could happen . '' During questioning , Leanna Harris `` made similar statements regarding researching in car deaths and how it occurs , '' police said . The time frame for when this alleged research took place remains unclear . Wife stands by Harris . Cooper , who died June 18 , was buried Saturday in Tuscaloosa , Alabama . At his funeral , Leanna Harris said she loves her husband and stands by him . `` Am I angry with Ross ? '' Leanna Harris told a crowd at the funeral . `` Absolutely not . It has never crossed my mind . Ross is and was and will be , if we have more children , a wonderful father . Ross is a wonderful daddy and leader for our household . Cooper meant the world to him . '' Harris calls in . Though Harris was n't allowed out of the Cobb County Jail to attend the funeral , he called in and spoke to the entire auditorium on speakerphone . `` Thank you for everything you 've done for my boy , '' he said . `` Good life . ( Inaudible ) No words to say . Just horrible . ( Inaudible ) I 'm just sorry I ca n't be there . '' `` He told everyone he loved them and started crying again . Carol Brown , a longtime family friend , was one of those in attendance . `` I mean he could have gone to the car and not seen the little boy , if the boy was sleeping , or you know ... it could happen , '' she said . `` He could have been distracted . But I do have questions about it . '' Timeline of events . Initially , police described the death of the toddler as the result of tragic absent-mindedness . They said the dad had apparently forgotten the boy was in the back seat of his Hyundai Tucson ; he did n't remember until he was done with his workday , drove a couple of miles and pulled into a shopping center parking lot . But suspicions grew as police investigated . On the day Cooper died , his father stopped for breakfast at a fast-food restaurant and afterward strapped his son into a rear-facing child restraint seat on his SUV 's back seat , police said . He drove to his workplace , a Home Depot corporate office , about a half-mile away . He works as a Web designer there . Usually , he would take his son to an on-site day care . But that day , police said , Harris left him in the car seat . During his lunch break , he returned to his car , opening the driver 's side door to put something inside , police said . After work , around 4:16 p.m. , the 33-year-old father got in his car and drove away . A few miles away , he stopped the car at a shopping center and called for help . When it became clear Cooper was dead , Harris was so inconsolable police had to restrain him . `` What have I done ? '' he wailed as he tried to resuscitate the boy . The Cobb County medical examiner 's office found the child 's cause of death `` consistent with hyperthermia and the investigative information suggests the manner of death is homicide , '' according to a Cobb County Department of Public Safety statement issued last week . Temperatures hit 92 degrees Fahrenheit on the day of Cooper 's death . The medical examiner 's office is waiting for toxicology test results before making an official ruling as to the cause and manner of the toddler 's death . Mom of toddler who died in car 'absolutely not ' angry with husband . Toddler 's dad researched hot-car deaths of children online , officers said in warrant . Police : Georgia mom also searched Internet on child deaths in cars . 5 key questions . CNN 's Vivian Kuo , Marlena Baldacci and Nick Valencia contributed to this report .
Justin Ross Harris is charged with murder , child cruelty . A grand jury indicted Harris, a 37-year-old man from St. Louis, on Monday in connection to the death of 4-year-old Jayme Closs last month. A probable cause hearing will take place Thursday .