Baby Lisa Irwin: New Surveillance Footage of Mystery Man

Oct. 23, 2011— -- New surveillance footage of a mystery man may support the claim by the parents of Lisa Irwin that their daughter was abducted.

In video obtained exclusively by "Good Morning America," a man dressed in white is seen leaving a wooded area, at 2:30 a.m. the night of Lisa's disappearance.

The family says Lisa was abducted and they point to key witnesses who saw a suspicious man that night, carrying a baby.

Mike Thompson told ABC News that he was on his way home from work around 4 a.m. on Oct. 4 when he saw a man in a T-shirt carrying a baby at an intersection about three miles from the Irwin home.

It was shortly after 4 a.m. that Lisa's parents said they discovered she was missing.

"[At] 4 a.m., 45 degrees, baby don't have a coat or nothing and this guy is walking down the street and I thought it was kind of weird," Thompson said.

He thought the sight was so unusual that he recalled considering offering the man and baby a ride home, but couldn't because he was on his motorcycle.

He later reported what he saw to police and told ABC News he is convinced the baby was Lisa.

Thompson described the man as around 5-feet-7, between 140 and 150 pounds and in his late 30s or early 40s.

A few hours earlier, a couple living three houses down from the Irwin family said they saw a similar sight. A woman and her husband said they saw a man in a T-shirt carrying a baby. They thought the situation was so unusual that they reported it to police on the morning of Oct. 4.

"It was shocking because I couldn't imagine anyone outside walking with their baby in the cold like that with no clothes on," the woman told ABC News.

Bradley has said that Lisa was wearing purple shorts and a purple T-shirt when she last saw her, but the neighboring couple said the baby they saw did not appear to be wearing any clothing.

"We seen the little arm, the leg, it didn't look like the baby had on any clothes, just a diaper," she said.

ABC News consultant and former FBI agent Brad Garrett said the timeline of events is strange.

"Are you going to logically abduct a child, let's say in the midnight area, then 2-4 hours later, you are spotted in the proximity of the neighborhood. I mean, that doesn't make any sense," he said. "It could be true, of course, but the logic of abducting a child is so you can take the child to some other location."

Dumpster Fire Investigation

GMA has also learned that police are investigating a fire that took place at a Dumpster at that same time, in that same area.

That dumpster fire could explain not only why burnt clothes were shown to Lisa's parents during their interrogation, but also why authorities searched an area landfill as part of the investigation.

The Dumpster where the fire occurred is emptied at the landfill.

The man who reported the fire told GMA that flames were shooting several feet into the air, and he believes some kind of accelerant was used.

Cadaver Dog 'Positive Hit'

Overnight, family lawyer Cyndy Short, gave GMA an exclusive tour of the home where Baby Lisa went missing.

It was the first time Short saw the home, and she said that what she found surprised her.

On Friday, cadavar dogs had a "positive hit" at the foot of the parents' bed. But last night, the rug was still there, intact.