after a while to get too close to the children. he always wanted to be their friend, more so than the friends of an adult. >> within 24 hours of finding joshan's body, investigators went to hansen's trailer to question him, but he was gone. >> we talked to the park manager and some of the neighbors and they said they hadn't seen him in a day or two. >> a background check revealed hansen, a day laborer, estranged from his wife, had no history of violence. >> a 60-year-old man, having teenagers visit the house and hang around, i think it does lead to suspicion as to what is going on. >> while police searched for hansen, criminalists measured for tire impressions found near joshan's body. those measurements and tread patterns were entered into a computer database of 20,000 different tires manufactured around the world. >> there was then seven different manufacture models