able to plot out the crime and covering of tracks as he did. >> this was just another project for him. he did it. >> got a problem. going to approach this like an engineer. how do i approach the problem. >> he mathematically solved his problem. >> during that jailhouse interview, hemy explained to the prosecution psychiatrist. >> but amid all the expert witness testimony over several days, debating hemy neuman's health, a hypothetical question posed by the prosecution caught the most attention. >> if it becomes this is in fact a plan by andrea and defendant to get rid of rusty so they could be together. >> if i knew they had corroborated together, yes, that would change my opinion.