he attempted to speak with clark to ask him if he had seen laura, clark sped away. 40-year-old hadden clarkown to police because of a past arrest for burglary. a few years earlier, clark had also been a suspect in the investigation of a missing young girl, a case that has never been solved. clark was born with brain damage and had difficulty throughout his life. he trained as a chef, but had difficulty keeping jobs. he was currently working as a gardener and other odd jobs. >> he was at one time in the united states navy, and he was discharged and diagnosed as a paranoid schizophrenic. >> clark was basically homeless, often sleeping in the back of his truck, which he parked in a church parking lot not far from the woods where the bloody pillow had been found. clark got into an argument with penny houghteling just one week before laura disappeared over some tools penny said were missing from her tool shed. the houghtelings also kept a spare house key in the shed. when the police researched clark's financial records, they learned that he had purchased duct tape, braided rope, and nylon cord s

it makes all the difference in the world and allows you to get people like hadden clark off the street >>> when a 2-year-old boy was rushed to the hospital suffering from brain seizures and breathing problems, doctors could not find the cause of the illness. but the boy's sister provided an important clue. the possibility of a rare syndrome few had ever heard of. >>> in 1987 ray and tanya reid along with their two children had just moved to urbandale, iowa. it was ray reid's fourth job transfer in three years. >> every time we moved it was an advancement for him. and i was ready -- any time he wanted to go, i wanted to go. >> tanya reid was a housewife, who stayed at home to care for her children, 6-year-old carolyn and 2-year-old michael. just two days after moving to town, their youngest child, michael, stopped breathing. fortunately, tanya was a nurse and knew exactly what to do. she performed cpr and immediately took him to the emergency room of iowa methodist medical center. >> it was fever of viral etiology, dehydration, and vomiting. that was a pretty standard diagnosis and situ