SAN DIEGO, Calif. (CBS 8) - A registered sex offender murders a young woman and dumps her body in a remote area. We're not talking about Chelsea King or Amber Dubois. We're talking about the murder of Brittany Hart in 2007. Now the Hart family is joining a call to action.

"Here it is three years later and there's not a second that goes by that Brittany's not on my mind," said Brandy Reynolds, Hart's sister.

When sex offender Robert Carson grabbed a hammer and beat 24-year-old Brittany Hart to death in his Spring Valley home, nobody proposed a one-strike law or lifetime GPS monitoring for sex predators.

"It's horrible. It took Brittany and Chelsea and Amber to finally get somebody to listen and do something about these monsters," Reynolds said.

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