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Twin sisters say they were attacked by a Black man. Are they telling the truth or hiding a family secret? "48 Hours" contributor David Begnaud reports.

Angela Brosso, 21, and Melanie Bernas, 17, were separately killed while riding their bikes along the Phoenix Canal.

These murders became widely known as the Phoenix Canal Murders," says Briana Whitney, the true-crime reporter for CBS affiliate KPHO-TV in Phoenix.

Investigators got a break 21 years after the murders when, thanks to DNA and genetic genealogy, they zeroed in on 42-year-old Bryan Patrick Miller, a divorced father raising his teenage daughter. Investigators soon found out that Miller had an alter ego. He was a local celebrity known for participating in parades and festivals as the "Zombie Hunter," a zombie-slaying comic book hero armed with a larger-than-life Gatling gun.

Detectives just needed a sample of Miller's DNA to make the case or eliminate him as a suspect. That quest took them to a local Chili's.

Lyle and Erik Menendez have already spent nearly 34 years behind bars for gunning down their parents in 1989. Now they're awaiting a judge's decision on whether new evidence can support their claim that they killed in self-defense and should have been convicted of manslaughter instead of murder. Lyle Menendez gives his side of the story.

Well-known beauty executive Fabio Sementilli was sitting by his swimming pool when he was brutally stabbed to death. His body was discovered by his then 16-year-old daughter Isabella on Jan. 23, 2017. Prosecutors say his wife, Monica Sementilli, was secretly having an affair with racquetball instructor Robert Baker. Baker defends Monica Sementilli.