the week leading up to the crash, german prosecutors said he studied medical treems various ways and possible methods of committing suicide, and cockpit doors and their security me showers. evidence of how he did it but why still a mystery. now, french officials say they have been able to recover dna for 150 people. still no ids as of now as they have not matched the dna to the samples they were able to take from family members. they are not going to release the bodies or body parts until they finish this investigation. willie? >> all right nbc's katie tur in cologne, germany, this morning. you think about the horror of the passengers but also for that pilot who, if you listen to the cockpit recorder was banging on the door then he went to an ax to try to get through. >> desperate. >> him, the one man who could save the plane helpless.