ru rusty sneiderman, a father and harvard grad, with everything to live for. >> rusty was a good dad.e loved his children. this twisted man devuated this rusty sneiderman. this is real. it's real. not tv. it's not make-believe. it's real. >> reporter: the case is now in the hands of the jury that will decide if hemy neuman will potentially spend the rest of his life behind bars or in a mental institution. for "nightline," i'm andrea canning, in new york. >>> and coming up, when 19 is not enough. a famously massive family wants to have another member. good willing. [ male announcer ] if you believe the mayan calendar, on december 21st, polar shifts will reverse the earth's gravitational pull and hurtle us all into space, which would render retirement planning unnecessary. but say the sun rises on december 22nd and you still need to retire, td ameritrade's investment consultants can help you build a plan that fits your life. we'll even throw in up to $600 when you open a new account or roll over an old 401(k). so who's in control now, mayans? ♪ oh, my maltipoo's depressed. but my afford