A former golden boy turned cold-blooded killer may be hiding among Mormons, says the FBI. The bureau tells ABCNews.com that Jason Derek Brown, one of the FBI’s 10 Most Wanted fugitives, is skilled at blending in with different crowds.

Mr. Brown is wanted for murder and armed robbery in Phoenix, Arizona. In November of 2004, the murder suspect allegedly shot and killed Robert Keith Palomares, an armored car guard, outside a move theater and stole $56,000 in cash before escaping on a bicycle to his getaway car.

The FBI says that Mr. Brown’s background suggests that he has the ability to turn himself into someone he is not. An FBI most wanted flyer notes that that murder suspect speaks fluent French and has a Masters Degree in International Business. He is also an avid golfer, snowboarder, skier and dirt biker. The flyer also says that Mr. Brown has been known to frequent nightclubs and enjoys showing off his high-priced vehicles, boats and toys.

“It’s a possibility because of Jason’s familiarity with the Mormon church,” Special Agent Manuel Johnson tells ABCNews.com. “Prior to the shooting he was involved in different types of fraud, so he’s not who he claims to be and we could see him taking advantage of people.”

Mr. Brown is a former resident of Salt Lake City and served a mission for the Church of Jesus Christ of Latter Day Saints in France.

According to The Associated Press, the last confirmed sighting of Mr. Brown was in Salt Lake City, when a friend saw the fugitive stopped at a red light near the Hogle Zoo. This is close to where the suspect lived several months before Mr. Palomares was killed.

FBI Agent Lance Leising, who has been working on the case for several years, tells The Salt Lake Tribune that Mr. Brown is a skilled liar and adept at convincing people that he is someone other than himself. Agent Leising believes that the murder suspect could be taking advantage of a Mormon church member’s philanthropy in order to survive in the Mormon community.

“With the commonness of his name and how he looks, like a surfer dude in California, we’ve had more tips (for this) fugitive than any other on ‘America’s Most Wanted.’ It’s caused us to chase leads all around the world,” Mr. Leising tells the newspaper.

According to the FBI, their search for Mr. Brown has turned up plenty of leads but no suspect. The Daily Beast reported in June that the murder suspect’s uncanny resemblance to actor Sean Penn has caused FBI agents to mistakenly arrest Mr. Penn’s body double on more than one occasion.

Prior to his disappearance and murder charge, Mr. Brown wrote letters home from France while serving as a missionary.

“There are days that are really really tough when no one wants to listen to us and you just wonder whats this all about,” he wrote in January 1989 to his father’s parents, according to The Daily Beast. “Then there are days that you have a baptism and your on top of the world wishing you never had to come down.”

“The Ghost,” by Paige Williams, offers a gripping narrative of Mr. Brown’s path from golden boy to cold-blooded killer.

“He left his family with artifacts of a life interrupted, unexplained, unfulfilled,” Ms. Williams writes. “He left Arizona as Phoenix scrambled to find the killer of a twenty-four-year-old armored-car guard, shot five times in the face. He left it all and still he lingers, because that’s what ghosts do. They haunt.”

The FBI warns that Mr. Brown may be in possession of a Glock 9mm and a .45 caliber handgun. The fugitive has ties to California, Utah and Arizona.

An arrest warrant was issued for Mr. Brown in 2004. The FBI is offering a reward of up to $100,000 for information leading to the arrest of Mr. Brown.