>> we know it was marissa devault in the bedroom with the hammer.ng about why did she do it? did she have any justification? >> do find the defendant count one first degree murder guilty. >> reporter: murder in the first degree. guilty. this week, the jury ruling 36 year-old marissa devault, mother, stripper and gold digger, was now a killer too. >> it's unfathomable. why did dale die? it seems like they proved in court that he died for money. >> why did he put up with her, do you think? >> he loved her. she killed the one person who ♪ a great performance: a perfect balance of grace and power. the incredible windtunnel® air steerable from hoover. with exclusive windtunnel® technology to remove stubborn, deep down dirt, and it steers with just a flick of the wrist. powerful, and lightweight. the windtunnel® air steerable, where grace and power are perfectly balanced. because black friday has come to springtime. whoo-hoo! let's do this. more saving. more doing. that's the power of the home depot. spring black friday is now. roundup now just $7.88. has

>> they will probably be trying to put themselves in marissa devault's place in the bedroom the night that she killed her husband. and that's the critical question. was she justified when she grabbed the hammer? >> reporter: devault faces the death penalty if convicted, as does jodi arias, who was found guilty of murder but has yet to be sentenced. >> we the jury do find the defendant as to count one first degree murder, guilty. >> death penalty on the table in this case. what do you think the possibility is that she will get the death penalty? >> prosecutors don't seek death against women that often, because when you look at who women kill women primarily kill their children, their lovers, their husbands. they usually kill people they're emotionally tied to. >> reporter: for "nightline" i'm ryan smith in new york. >> coming up next here on "nightline," the seven americans on a mad dash for hidden treasure on one of the most remote and inhospitable places on earth. as a police officer, i've helped many people in the last 23 years, but i needed help in quitting smoking. [ male announce