. >> reporter: alana smith is a top runner at danbury high school. competition is in her blood.er father, a former pro baseball hall of famer. her mother, a former elite runner herself. what does running track mean to you? >> it means everything to me. it gives me a spot to be myself. when i go to practice, i go and get to hang out with my friends r. also, i love to win. >> reporter: alana says winning felt out of reach. she joined other high school runners in a lawsuit, hoping to ban trans girls from competing against cisgendered girls like her in connecticut. >> i feel it's strictly about biology and it's unfair for them to compete in our category. there's a broad coalition of people from all different political persuasions that agree that the physical advantages that men and boys have over women and girls is insurmountable. >> reporter: kristin wagner is a lawyer for the alliance defending freedom, a self-described conservative christian nonprofit. they helped file the connecticut lawsuit last year and it marked a tipping point, sparking a nationwide debate about fairness and

alana, something like that. >> but it was what the inmate told prosecutors about the times of the murder that they found particularly chilling. smithfor valentine's day. >> it was supposed to be some type of present to this other chick. >> to the -- i think you referred to her as ana? >> yeah, yeah. >> and there it was, nathan's motive. prosecutors said he killed his wife so he could be with his true love, aina. >> this was his valentine's day present to aina. and that -- that is despicable. >> aina, who prosecutors said was nathan's motive for the murder, was about to take the stand. the star witness at the biggest trial in town. >> please state your name. >> aina dobilaite. >> coming up -- nathan's note to aina. >> theirs nothing more important to me than you and this relationship. >> and a note to him from the woman he's accused of murdering. >> she was speaking from the grave in a way. >> absolutely. >> when "dateline" continues. and tonight's winning numbers are 18, 18 55, 39, 71, and 43 we won! yes! noooo... noooo... noooo... quick, the quicker picker upper! bounty picks up messes quicker and each sheet is 2x more absorbent,