Police may never figure out what led the man who had been committed to mental hospitals several times to enter theatre No. 4 at the Carmike 8 outside Nashville.

Anxious, ill and breathing arduously, Luka Magnotta recounted for the first time earlier this year his version of the night he killed 33-year-old Jun Lin.

Dr. Thomas Barth, a German psychiatrist who met with Magnotta in 2012 following his arrest testified that he believes the accused was suffering an episode linked to suspected paranoid schizophrenia.