rudin mason. i did not kill ron.on me. >> she's been locked up for the past 20 years for the brutal beheading and murder of her millionaire husband ron rudin. >> they had no evidence. they had no witnesses. >> margaret rudin, dubbed the black widow of las vegas. >> black widow. >> black widow. >> they stuck the name on me -- black widow, black widow, black widow, like i had killed somebody before, or like that i was in the habit. i think that people don't know me. they don't try to know. >> margaret rudin is a chameleon. she's been a blonde, a brunette, a redhead. >> i like change. i'm a gemini. >> she's a chameleon, definitely. >> i like to wear wigs. i like short. i like long. i like curly. i like straight. i don't want to look the same way all the time. even when i sit in front of your cameras, i may look different. but you're still going to know it's me. >> i'm greg mullanax. i'm an attorney here in fresno, california, and i represent margaret rudin. >> there are so many holes in this case. after going through al

ron. they zeroed in on me. >> even though it's circumstantial, all the evidence pointed to margaret rudin. margaret was responsible for ron's death. >> reporter: now released, margaret rudin is sitting down with abc news to tell her story. >> margaret rudin, dubbed the black widow of las vegas. >> black widow. >> black widow. >> they stuck the name on me, the black widow, black widow, black widow, like i had killed somebody before, or like that i was in the habit. >> margaret rudin is a chameleon. she's been a blond, brunette, a redhead -- >> even when i sit in front of your cameras i may look different, but you're going to know it's me. they never checked on anyone but me. i want the truth to come out. i have waited a long time. >> reporter: ronald rudin was a wealthy real estate developer. a larger-than-life figure in las vegas. >> he had a twinkle. he was very handsome. not just your average handsome, he really stood out. >> when it came to his marriages, ron went through wives like a casino dealer goes through packs of cards. >> reporter: ron had been married four times already when he