MONTGOMERY, Alabama — The FBI’s Cold Case Initiative is investigating the 46-year-old case of a Massachusetts minister who was beaten to death in Alabama while doing civil rights work, a spokesman said Friday.

The Rev. James Reeb, a Unitarian Universalist minister from Boston, was among a group of ministers who traveled to Alabama in response to the Rev. Martin Luther King Jr.’s invitation to join the 1965 Selma-to-Montgomery march for voting rights.

The FBI launched an initiative in 2007 to investigate unsolved murders from the civil rights era. A spokesman with the agency, Chris Allen, said Reeb’s case is one that is currently open.

The lead state prosecutor for Selma, District Attorney Michael Jackson, said he has met with FBI agents at least twice about the case. He said the agency is actively investigating.

Reeb and two other white ministers had just finished dinner at a historically black restaurant in downtown Selma when they were attacked by a gang of whites on March 9, 1965. The city was a center for voting rights demonstrations by blacks and white supporters at the time.

Reeb, 38, died two days later, leaving behind a wife and four children.