for the girls and 39 years later, maryland police interviewed a person of interest. 57-year-old lloyd welch for sex crimes. >> we have established that welch was observed paying attention to the lyon sisters at the plaza. and welch has multiple convictions for fences if against young girls and incarcerated since 1997 in the state of delaware for one of these offenses. >> reporter: the girl's father was a well known permanent in washington. he wrote me and said the family will do no introduce until this thing is over. the police spokesman read a statement. >> they care about the case means a great deal to us. >> reporter: it had a profound affect on the way the parents super vise the kids in the area. wes baker was the same age as 10-year-old kathleen lyon. >> we were going to the play basketball and jump on the bus and go someplace and i think that i remember my parents being more strict about things like that and being careful at least for a while. >> reporter: police are asking for the public's help. and point out welch mug shot bears an uncanny likeness to the artist rendering of a man n

the fbi says it has received 75 tips since identifying lloyd welch in the disappearance of the lyon sistershey vanished almost 40 years ago after going to wheaton plaza to see the easter decorations. they have never been found. welch is serving time in prison in delaware. >>> happening today, if you live in the district, you can get help filing your taxes for free. d.c. delegate eleanor holmes norton is hosting her financial services fair this evening at the washington convention center from 10:00 to noon. you have to be a district resident and make $52,000 or less to get your taxes down by free. irs certified tax preparers will be on hand. >>> big hills like this one after the snowstorm, now the plans that could spoil the fun in one neighborhood. >>> plus, they're not your average holiday sales, the special discounts available this weekend only. >>> and a live look in mclean. he'll let us know when we can see calmer conditions ahead. >>> happening today across the country despite the wintery weather. it might be a good weekend to get out and see some national parks. in honor of presidents'

that sketch also resembles the person of interest, 57-year-old lloyd welch. known as michael welch. he's been arrested several times for sex offenses against young girls. police say he spent years traveling the country and they believe he has other victims who could provide information. >> it's not an easy thing to come forward if you have been assaulted or if you know someone who has. you may have tried to put it behind you, but the information you provide could help lead us to information about what happened to sheila and katherine. they deserve justice and their family deserves closure. >> the girls' older brother is now a police officer. they released this statement saying, quote, throughout the years our hopes for a resolution of this mystery have been sustained by the support and efforts of countless members of law enforcement and the news media and the community, the fact that so many people still care about this case means a great deal to us. one of the most famous cold cases in the d.c. area. 39 years and not a single tip worth pursuing. >> thanks so much. >>> a nascar lege

. >> in recent months, they noticed a man named lloyd welch had been interviewed the day of the disappearanceer imprisoned in di ee for unrelated incidents. last week, he was named a perb of interest. >> we don't have enough information to link anyone beyond a reasonable doubt to this case. we're hopeful that somebody is going to have something that gives us that additional information that we need. >> we have made the request to interview him, and he doesn't want to talk to us. >> we have a perfect storm, a carnival worker, sex offender, moving about the country. moving across state lines. has easy access to children. >> welch is set to be released in teb years. given that perfect storm, experienced police investigators believe it's almost inevitable he committed other crimes in other jurisdictions, so that's why they're offering all this publicity, hoping to link him to some other crime in some other case, insuring he never gets out of jail. in wheaton, maryland, dug mckelway, fox news. >> we'll follow that case. >>> sweet marketing from a girl scout. sour grapes from a news station, and wi

the police believe that lloyd lee welch was there at the time.s previously convicted of assaulting girls in virginia and delaware. he used to work as a carnival ride operator. >>> let's head to washington d.c., and joey chen is there. >> to leave worries in your mouth, you probably heard about the controversy over the ingredients in subway sandwiches in the buns. and it may be changing the recipe, but it's not just subway. turns out that the chemical may be in a lot of things you're eating. it begs the question, is it a serious risk or benign? >> . >> and three other things that are common and worth a second look for all of us who worry about what we eat. >>> we'll meet the advocates behind this campaign. at the top of the hour on america tonight. see you then. >> tomorrow marks the 30th anniversary of a huge victory for native americans in the northwest. they won the right to fish beyond their reservations, but yet their legal battle is far from over. we have the story from washington. >> this is where the game wardens come down from all of us,

his name, as we heard, is 57-year-old lloyd lee welch, a drifter, one time carney. of sexual offenses with minors. what are the problems with a 39-year-old case like this. what are the problems with the 39-year-old case? >> 39 years old, it's obvious. and you have neither victim found, deceased or otherwise. you have that problem. you really have no vehicle description. you really don't have a physical description. what is going on here is a cold case team got ahold of the case. they go back to square one. they think everybody interviewed and every name in the murder book or that is missing or that abduction, kidnapping book or however they characterize and you look at that and you start finding out where everybody is and what they have done. and when he popped up to be a sex offender in prison that m.o. could possibly have matched a trail of victims that he actually pursued in that employment. so i don't think this press conference was a casual -- i think they are on to something and i think they believe that. the difficulties are obvious, 39 years without forensic

county, maryland, to interview 57-year-old lloyd lee welsch, already in prison for child sex offenses in other states. >> we have also established that welchserved paying attention to the lyon sisters while at wheaton plaza. welch now has multiple convictions for sexual offenses against young girls and has been incarcerated since 1997 in the state of delaware for one of these offenses. >> the girls' father, john lyon, a once popular radio personality in washington, e-mailed us last night to say that the family will do no interviews until, quote, this thing is over. the germs' disappearance had a profound effect on the carefree way many parents supervised their kids in that era. wes baker grew up not far from the lyon family. >> we would walk miles to play basketball or walk to the shopping center, even jump on the bus to go someplace, and i think, i remember my parents being a little more strict about things like that and being careful, at least for a while. >> welch's mugshot from a 1975 arrest bears an uncanny likeness to the artist's rentering of a man seen near the girls that day. police are seeking the public's help to stimulate leads

lloyd lee welsh jr., a sex offender in prison for unrelated crimes. why? >> investigators have established the fact that welch was at wheaton plaza on march 25th. 1975. we've also established that welch was observed paying attention to the lyons sisters while at wheaton plaza. welch now has multiple convicts for sexual offenses against young girls and has been incarcerated since 1997 in the state of delaware for one of these offenses. >> join me now, john ryan, president and ceo for the national center for missing and exploited children. welcome. i know you know this. so many cold case, unsolved this this country. the fact you have chief and montgomery police four decades later, coming out, showing this guy's picture, releasing his name. what does your gut tell you about this? >> first we commend the fbi in baltimore p.d. for continuing this investigation. it will be almost 40 years since these two young girls were abducted. but that's not an aberration anymore. law enforcement, has focused more resource, energies, constantly reviewing these cases of long-term missing children and the good news is we see succ