Surveillance footage of a mystery man leaving a wooded area on the night of baby Lisa Irwin's alleged disappearance nearly three weeks ago was located at a gas station in Kansas City near Deborah Bradley and Jeremy Irwin's home. The security camera shows a man dressed in white leaving the woods at 2:30 a.m. just two miles from baby Lisa's home.

The video was first reported by ABC News and police are now investigating the tip.

The surveillance video is consistent with three eyewitness reports of a man wearing a white T-shirt and wandering the streets in the early morning of baby Lisa's disappearance. The eyewitnesses claim the man was carrying a baby wearing no more than a diaper.

It was shocking because I couldn't imagine anybody outside walking with their baby in the cold like that with no clothes on, a female eyewitness told ABC News.

Despite the eyewitnesses' reports, authorities seem to have kept their focus on baby Lisa's parents and their home in Kansas City. After obtaining a warrant to prevent Bradley and Irwin from returning to their home until police completed their investigation, authorities scoured it looking for evidence in her disappearance on Oct. 17.

I really cannot comment on what the detectives know and have done, Kansas City Police Capt. Steve Young said Sunday to The Kansas City Star.

However, an affidavit of the search indicated that a cadaver dog picked up the scent of a dead body close to Lisa's mother's bed.

Joe Tacopina, one of the attorney's in Bradley and Irwin's legal team, questioned the meaning of the cadaver dog hit. On NBC's Today Show Monday, he said that the dog could have picked up a scent from toenails or a dirty diaper. Tacopina dismissed claims about the baby's possible death, calling the hit a red herring.

However, Brad Garrett, an ABC News consultant and former FBI special agent, told ABC News that cadaver dogs tend to be accurate. 

In studies done of cadaver dogs where the dog has direct access to the scent and it's reasonably fresh -- it's above 90 percent, Garrett told ABC News.

Still, police claim the cadaver dog hit is not conclusive evidence and will require further investigation from authorities.

Baby Lisa's parents, Deborah Bradley and Jeremy Irwin, attended a candlelight vigil Sunday night at their family home, according to The Kansas City Star. Authorities say that baby Lisa's mother, Bradley, has refused to speak to police.

Bradley and Irwin wore yellow ribbons and white t-shirts with their daughter's face printed on it along with information about her kidnapping at the vigil. It was the first public appearance for the parents in a few days.

My fear is that we have missed this critical time to find this baby, Cynthia Short, an attorney for the parents, told KCTV. It really breaks my heart that we have been looking in the wrong direction, and as a result of that we might not get the happy ending that we want.

Baby Lisa's parents claim the 11-month old mysteriously disappeared from their home late Monday night or early Tuesday morning nearly three weeks ago. Irwin, an electrician, maintains that he returned from work around 4 a.m. Tuesday to discover baby Lisa missing. The parents say they searched frantically for baby Lisa early Tuesday morning, but found only the front door unlocked, a window opened, house lights turned on, and three cell phones missing.

Lisa's mother, Bradley, has been the focus of heavy attention by police and media alike. She admitted to drinking heavily on the night Lisa disappeared and says she may have even blacked out. She claims she did not see the baby after putting her to bed around 6:40 p.m., though she initially told the police she had put her daughter to sleep around 10:30 p.m.

Despite over 500 tips, police still have no major suspects or leads in the investigation.

Watch the Surveillance Video as found by ABC News: