A retired FBI agent testified Tuesday in the federal trial of James Ford Seale.
Ed Putz testified that he helped arrest Seale on a state murder charge in the 1964 deaths of two black teenagers.
Seale is being tried on federal kidnapping and conspiracy charges.
Putz said he and another FBI agent assisted two state Highway Patrol officers in arresting Seale at his home in Meadville on Nov. 6, 1964.
Putz said while the group traveled to Jackson together he took the opportunity to talk to Seale. He said he told Seale, "You didn't even give them a decent burial. We know you did it. You know you did it. God knows you did it."
The agent said Seale's response was, "Yes. I'm not going to admit to it. You're going to have to prove it."
The state murder charge was later dropped.
Seale was arrested this time in January on federal kidnapping and conspiracy charges for the abduction of Henry Hezekiah Dee and Charles Eddie Moore. He has pleaded not guilty to all charges.