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From some independent investigators also working the case, a possible connection. >> there were credit card records that placed durst in the eureka area the day that this girl disappeared. >> reporter: the transaction was just up the coast in trinidad, maybe 20 minutes or so by car from that spot where the witness saw a girl picked up on the road in eureka. and then, before the trial in galveston, birkbeck heard this. >> i have a really good source that was close to the defense team. and i was told that durst, he was extremely concerned about karen mitchell. and was so concerned that he though...

Said, because she knew too much. she knew his secrets. >> towards the end of her life she was very agitated with him. >> reporter: would he save her? susan didn't know, said barbara. and then, just before christmas, 2000, she said susan let her know that bob was on the way with money. >> he said, "i'll bring it." and that's what happened. but i can't prove it. >> reporter: l.a. cops have long suspected bob did go to susan's house in l.a. but not to bring her more money. to prevent her from talking. ever. we do know from flight records, and bob's own personal account, that he did go to californ...

In 1997, a pretty teenager named karen mitchell was helping out at her aunt annie caspar's shoe store. >> i did not ever meet robert durst, but my manager, she said she remembered him because he just dressed as a woman. >> reporter: karen might well have met robert durst, said aunt annie. she often helped eureka's homeless population, people among whom bob was known to mingle. we can't know for sure. but we do know she was in bob's neighborhood. more than once. >> karen used to go to trinidad on the bus. i mean, they could have met. it's definitely a possibility. she liked unusual people. she ...

Least not back then. years passed. and then matt birkbeck, who authored a book on durst called "a deadly secret," got a tip from some independent investigators also working the case, a possible connection. >> there were credit card records that placed durst in the eureka area the day that this girl disappeared. >> reporter: the transaction was just up the coast in trinidad, maybe 20 minutes or so by car from that spot where the witness saw a girl picked up on the road in eureka. and then, before the trial in galveston, birkbeck heard this. >> i have a really good source that was close to the d...

>> reporter: of all the places robert durst wandered, this was not just a favorite. but now the setting of a lingering mystery, california's lost coast. in 1997, a pretty teenager named karen mitchell was helping out at her aunt annie caspar's shoe store. >> i did not ever meet robert durst, but my manager, she said she remembered him because he just dressed as a woman. >> reporter: karen might well have met robert durst, said aunt annie. she often helped eureka's homeless population, people among whom bob was known to mingle. we can't know for sure. but we do know she was in bob's neighborhoo...