As an African-American teenager in Louisiana, Keith Beauchamp tried interracial dating -- behavior that prompted his parents to tell him the grisly tale of Emmett Till, who was murdered for whistling at a white woman.

Beauchamp's 2005 documentary on Till, in large part, led the federal government to reopen the 1955 murder case. Last year, a grand jury declined to indict Carolyn Bryant Donham, the object of the whistle, on a manslaughter charge. The two men who brutally beat the teen and dumped his body in a river died years ago.

Still, Beauchamp's documentary expertise and his ability to persuade people to talk about buried secrets of the civil rights era have earned him a rare collaboration with the FBI.

Now, Beauchamp is filming a series of documentaries based on civil rights killings for the cable channel History as well as TV One. Any new evidence Beauchamp uncovers is shared with the FBI for its Cold Case Unit that focuses on crimes that have gone unpunished from that era.

In turn, the FBI is arranging interviews for Beauchamp with veteran agents who covered the cases and other contacts, said agency spokesman Ernie Porter.

"In the sense that we would go hand-in-hand conducting joint investigations, no. He's not law enforcement," said Porter. "What we are doing is cooperating with him."

Beauchamp believes he's able to coax more from potential witnesses because he doesn't carry the stigma often associated with law enforcement officers. Images of billy club-wielding policemen breaking up rallies and protests are still etched in many memories.

"For the first time in history, they are allowing a filmmaker to assist them in setting up a justice-seeking atmosphere that will allow eyewitnesses who may have information to feel comfortable coming forward," Beauchamp said of the FBI.

Beauchamp said the FBI has shared with him their five priority cases. Since then, he's spent a lot of time in the South, staging re-enactments and interviewing witnesses on film.

On a recent trip to Mississippi, Beauchamp interviewed Sen. David Jordan, D-Greenwood, at the state Capitol. Jordan was questioned about the 1955 murders of the Rev. George Wesley Lee and Lamar Smith. The men were killed months apart, but for the same reason: They were trying to register blacks to vote.

In a darkened committee room, Jordan peered down a camera lens and discussed how his father, Cleveland Jordan, a black sharecropper who was a civil rights activist, attended Lee's funeral. Jordan said the preacher had been shot in the face. His killing occurred the same year as Till's.

"I said then I would not leave Mississippi. I'm going to stay here and fight these conditions," said Jordan, who was a teenager when the murders occurred. The hour-long shows are scheduled to begin airing this summer on TV One and History.

The outcome of the Till case still rankles Beauchamp, but he believes there's a chance someone eventually will be indicted.

More than a half-century has passed since Till was snatched from a bed in his uncle's house in Mississippi. His killers were J.W. Milam and Roy Bryant, who was then the husband of Donham.

Till's body was found in the Tallahatchie River three days after he was abducted, a cotton gin fan was tied around his neck with barbed wire. His left eye was missing, as were most of his teeth; his nose was crushed, and there was a hole in his right temple.

Jet Magazine ran a picture of his body, and the killing was viewed as the beginning of the civil rights movement. An all-white Tallahatchie County jury later acquitted Milam and Bryant of the murder.

The new district attorney in Leflore County, Dewayne Richardson, said the Till case isn't closed, but no new information has surfaced. The FBI said its Till case is inactive.

"I want to keep that on the pedestal," Beauchamp said, "to finally get justice."