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New York architect charged in connection with long-unsolved murders of four women near Long Island beach, facing murder charges

They were megan waterman, amber costello, and melissa barthelemy. the bodies of all three were found in similar positions, wrapped in material. they were all found in roughly the same area on long island — which is to the east of new york city. the bodies of several other people were also found there around that time, as this graphic released by local police illustrates. while heuermann is only suspected of involvement in one other murder, investigations will be made to see if there are any other links. the case against heuermann was based on dna evidence from a discarded pizza box, cellphon...

>> tomorrow what we expect is during the arraignment, he will enter a plea. we expect not guilty. >> reporter: prosecutors allege he committed the quadruple murder november 13th. more than six weeks later, in pennsylvania, he was arrested at his family's home. >> we know he was arrested based on cellphone data, based on the make and model of his car and based very importantly on finding his dna on a knife sheath that was found at the scene. the prosecution has a number of pieces of really strong evidence here. the defense, i think, at this point, will say, why would he do this? what was the mo...

Course, gives us a sense of time. but unfortunately unless someone says who did it or what happened specifically its usefulness can be limited. >> reporter: san francisco's d.a. says she cannot confirm reports a knife was found near the crime scene but says cellphone data is key. >> we want to know who he's been communicating with just before he was stabbed, who he was with, what cellphone towers that cellphone was hit. are all critical pieces of evidence for us tracing backward to the moment this stabbing occurred. >> reporter: perhaps best known for creating the mobile payment service cash a...

Sweat more than you normally do. >> so was it unusual for you to take a shower when you got back to the house? >> not at all. >> evidence presented in court shows murdaugh left home to visit his mother on the night of the murders on 8:06 p.m. he had a pause saying he was briefly trying to locate his month. >> that minute or however long it was, were you disposing of the murder weapons, alex? >> no. >> were you disposing of bloody clothes? >> no. >> this is going to be the full time line. >> special agent peter analyzed cellphone data from phones belonging to the victims and alex murdaugh as we...