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Look at the evidence and then go where the evidence leads you. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove him around, looked after him. but it turned out nathan was at home in suburban dallas the night before the murder. his mother drove him to school...

Not yet. gotta take it slow. >> reporter: we try to look at it from a distance. you cant let your personal emotions get involved. >> reporter: yeah. >> you cant allow tunnel vision to take over. your job is to investigate. look at the evidence and then go where the evidence leads you. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if...

You cant let your personal emotions get involved. >> reporter: yeah. >> you cant allow tunnel vision to take over. your job is to investigate. look at the evidence and then go where the evidence leads you. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove hi...

Not yet. gotta take it slow. >> reporter: we try to look at it from a distance. you cant let your personal emotions get involved. >> reporter: yeah. >> you cant allow tunnel vision to take over. your job is to investigate. look at the evidence and then go where the evidence leads you. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if...

Still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove him around, looked after him. but it turned out nathan was at home in suburban dallas the night before the murder. his mother drove him to school that thursday morning.

>> reporter: yeah. >> you cant allow tunnel vision to take over. your job is to investigate. look at the evidence and then go where the evidence leads you. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove him around, looked after him. but it turned out nath...

Your job is to investigate. look at the evidence and then go where the evidence leads you. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove him around, looked after him. but it turned out nathan was at home in suburban dallas the night before the murder. hi...

Look at the evidence and then go where the evidence leads you. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove him around, looked after him. but it turned out nathan was at home in suburban dallas the night before the murder. his mother drove him to school...

Administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove him around, looked after him. but it turned out nathan was at home in suburban dallas the night before the murder. his mother drove him to school that thursday morning. he said he was doing homework in a computer lab at the time of the murder. but was he? >> and he was in school from what ti...

Look at the evidence and then go where the evidence leads ya. >> reporter: detectives were still canvassing fellow students, and teachers, school administrators. anybody who could help them nail down nathans movements on thursday morning, the time of the murder. and again, if anybody knew, it would be daniel. who, after all, watched over nathan, drove him around, looked after him. but it turned out nathan was at home in suburban dallas the night before the murder. his mother drove him to school ...