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AND MENTAL ILLNESS. >> I WANT TO STAY SOBER. I WANT TO NOT BE ANYTHING LIKE MY FATHER. AMY: ANDREA STIERS SAYS SHE GAVE UP ALCOHOL AND MARIJUANA THE DAY AFTER POLICE KNOCKED ON HER DOOR WITH NEWS THAT SHE HAD A HALF -SISTER WHO WAS MURDERED BY HER FATHER. SHE WAS FOUR THE LAST TIME SHE SAW HER BIOLOGICAL FATHER TERRY RASMUSSEN, BUT THIS CASE HAS UNLEASHED NEW MEMORIES. >> SHE WAS ADORABLE. I DIDN’T REMEMBER HER BUT I DO NOW. AM SHE HAS NOT BEEN IDENTIFIED YET BUT STIERS AND HER SIBLINGS , CALL HER A NEED A MOON. -- HER ANITA MOON. STIERS THINKS THE CHILD WAS HALF ASIAN AND HAS A THEORY ON WHY RASMUSSEN KILLED HER BACK THEN, BUT NOT ANDREA >> I THINK HE KILLED MY SISTER BECAUSE SHE DIDN’T LOOK LIKE HIM. I REALLY CAN’T STAND MY FACE SOMETIMES WHEN I LOOK IN THE MIRROR BECAUSE I LOOK LIKE HIM. IT’S HARD. SORRY. AMY: STIERS SAYS HER MOTHER BANNED THEM FROM ASKING ABOUT HER FATHER AFTER HE DISAPPEARED. >> OBVIOUSLY MY DAD WAS MENTALLY ILL AND ADDICTED TO ALCOHOL. THERE’S NEEDS TO BE LAWS TO PROTECT CHILDREN FROM THEIR DRUG ADDICTED AND MENTALLY ILL PARENTS. AMY: STIERS HAS FOUR ADULT CHILDREN AND SHE SAYS THEY ARE EMBARRASSED AND UPSET BY THE NEWS THAT RASMUSSEN, THE GRANDFATHER, IS THE BEAR BROOK KILLER. >> MY KIDS ARE ASHAMED. THEY DON’T WANT ANYBODY NECESSARILY TO KNOW. BUT THAT IS NOT THEIR SHAME, THEY DID NOT DO THAT. I TOLD HIM, YOU DID NOT DO IT. AMY: NOW STIERS IS ON A MISSION. >> I’M PUTTING AN EFFORT INTO CHANGING THINGS FOR LITTLE GIRLS LIKE MY SISTER. THAT’S PROBABLY THE BEST THAT I CAN DO WITH THE TRAGEDY. AMY: STIERS SAYS SHE SEES A THERAPIST AND TAKES AN ANTIDEPRESSANT TO HELP HER COPE. THE FAMILY HAS REQUESTED THE REMAINS OF THEIR HALF-SISTER FOR A DIGNIFIED BURIAL, BUT INVESTIGATORS SAY THAT WILL HAVE TO WAIT UNTIL ALL THE FORENSIC TESTING IS COMPL

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A daughter of suspected serial killer Terry Rasmussen says she hopes more can be done to protect children from parents who are suffering from addiction and mental illness.Investigators say Rasmussen has been linked to a series of killings, including the deaths of a woman and three girls whose bodies were found in barrels dumped in Bear Brook State Park in Allenstown. Andrea Stiers said she learned a year and a half ago that her father was a serial killer. The news immediately led her to consider her own choices."I want to stay sober," she said. "I don't want to be anything like my father."Stiers said she gave up alcohol and marijuana the day after police knocked on her door with news that she had a half-sister who was killed by her father. She was 4 the last time she saw Rasmussen, but she said the case has unleashed new memories."She was adorable," Stiers said of her half-sister. "I didn't remember her, but I do now."Stiers also said she met her half-sister around the last time she saw her biological father."I wish I would have grabbed her and took her with me," she said.The girl has not yet been identified, but Stiers and her siblings call her Anita Moon. Stiers said she thinks the child was half-Asian and has a theory on why Rasmussen killed her."I think he killed my sister because she didn't look like him," Stiers said. "I really can't stand my face sometimes when I look in the mirror, because I look like him, you know? It's hard."Stiers said her mother banned her and her siblings from asking about her father after he disappeared. Rasmussen died in prison in California, where he was serving a sentence for killing his girlfriend, Eunsoon Jun."Obviously, my dad was mentally ill and addicted to alcohol," she said. "There need to be laws to protect children from their drug-addicted and mentally ill parents."Stiers has four adult children, and she said they're embarrassed and upset by the news that Rasmussen, their grandfather, is the Bear Brook killer."My kids are ashamed," she said. "They don't want anyone to know, but I told them, 'That's not your shame.' I told them, 'You didn't do it.'"She's now on a mission."I'm putting an effort into changing things for little girls like my sister," she said. "That's probably the best that I can do with the tragedy."Stiers said she sees a therapist and takes an antidepressant to help her cope.The family has requested the remains of their half-sister for a dignified burial, but investigators said that will have to wait until all the forensic testing is complete.