The Return of El Nino

Scientists predict record cold weather could be replaced with record heat.
3:00 | 03/06/14

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Transcript for The Return of El Nino
Manhunt for a possible serial killer in the suburbs of Washington DC police looking for clues and three unsolved murders with striking similarities. ABC's David Curley on the evidence that may connect the dots. It was broad daylight a knock on the door when the door was open he started shooting longtime neighborhood piano teacher Ruth -- -- auto killed. That was a month ago and tonight evidence -- killing may be linked to two others meaning a serial killer could be at work in this Washington DC suburb. The similarities. And unusual nature of all three shootings. Occurring and Alexander require the police department to consider the possibility. That all the cases are linked together. The similarities. O'Donnell killed in February in November a local transportation official gunned down. And ten years ago a real estate agent and -- for the sheriff also shot and killed. All three involved in their community all gunned down in their homes a broad daylight all three killed within two miles of each other. Tonight police say forensic shows similarities in the bullets used in all three killings but they won't go as far as saying they came from the same gun. But those bullets do have the same general characteristics and are similar in design so the search is only intensifying for a suspect and a motive. He believes in his mind that these three people represent. The city of Alexandria and the city has wronged him in he's going to make it right. A bearded him balding white man -- -- they're looking for. Police have gotten 500 tips but no arrest -- warning to residents do not open your -- to strangers. -- a stranger possibly a serial killer. On the lose. David -- ABC news Washington.

This transcript has been automatically generated and may not be 100% accurate.

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