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River here couldn't get their supplies in. and eventually they retreated and retreated across the pontoon bridge right next to the main bridge. we were down there earlier on today. there are scavengers down there. but this is the scene of russia's retreat, that bridge. all of this zelenskyy taking in today as he said part of what he wants to do here is to -- is not only to connect kherson to the country, but connect himself to the emotion here of people because that, he said, is a motivating force for him, trying to deliver for the country right now. >> fascinating. that's of course that bridg...

IAS officer, Supriya Sahu recorded the video of the bridge while sitting inside her car. Alongside the caption, she wrote in the caption, 'Chennai the Chess Capital of India is all set to host the grand, Chess Olympiad 2022. The iconic Napier Bridge is decked up like a Chess Board.'

They poured over bus schedules, taxi and limo records. but in the end, they came up empty. >> you had no bridge video, you had no taxi receipts, you had no witnesses. you had nothing actually physically placing tony tung in teaneck. >> you're right. we didn't have him at the george washington bridge. we didn't. >> reporter: still, the investigators kept digging. remember those anonymous emails that had been sent to rob, suggesting that he was being watched? turns out they all traced back to tony tung. >> he created all of these on the same day, which was the same day that he learned about the ...

Dishes, clean the computers. >> reporter: for months investigators searched for evidence that tony had crossed the river from his home in manhattan to new jersey that night. they checked cameras at all the bridge and tunnel crossings. they poured over bus schedules, taxi and limo records. but in the end, they came up empty. >> you had no bridge video, you had no taxi receipts, you had no witnesses. you had nothing actually physically placing tony tung in teaneck. >> you're right. we didn't have him at the george washington bridge. we didn't. >> reporter: still, the investigators kept digging. ...

Frustrated. >> was it moving slowly as they claim? >> i'm sure for them it was moving slowly, but every investigation is different. >> in fact, this investigation was a lot further along than the protestors knew. >> coming up, a suspect but no evidence. >> you had no bridge video, you had no taxi receipts, you had no witnesses. >> we didn't have him at the george washington bridge. we didn't. >> then a break. the eerie e-mails. he used these e-mail addresses to start contacting mr. cantor. at some level just trying to shame him. >> could the sender be the killer? when dateline continues.