Transcript for FBI's Most Wanted Jason Brown: Average Looks Help Him Hide
Shifting gears here. Switching to one of the fbi's most-wanted. He's eluded capture because of his average looks. He's able to blend in just about anywhere, making him almost impossible to catch. This morning, his life on the run may finally be over. Abbie boudreau has the story. Reporter: This morning, jason brown is presumably still on the run, eight years to the day. Police say he brazenly robbed an armor's truck and killed the guard. This is a cold-blooded ambush. Reporter: Bro of the fbi's ten most-wanted fugitives. But he may not be last on the list. The fbi gets the most tips about him because they say, he's just so average. When you have someone that is very -- has common features, people will walk by someone, or they'll go into a coffee shop. And they go, that looks like that guy that was on "america's most-wanted." Reporter: Just look at him. In these new age progression photos, the now-43-year-old, could pass for the guy next door. Average height. Average weight. Even his name, jason brown is just, well, normal. If you keep your profile low enough, you can just sort of move through life and apparently mr. Brown has been very successful at that. Reporter: Brown seems to bear a remarkable resemblance to the not-so-average actor, sean penn. In fact, investigators say tips have led them to penn's movie body-doubles twice. But this morning, the fbi says it has a promising, new lead. Saying it's possible, brown, a former mormon missionary, could be hiding in utah. Then again, they say, jason brown could be anywhere. For "good morning america," abbie boudreau, abc news, los angeles.
This transcript has been automatically generated and may not be 100% accurate.