Three homicides, continents apart, all looked like professional executions, were they related?

Interpol, the FBI and local law enforcement searched for the answer.

They found it in an old typewriter and a used piece of tape.

On a January morning in 1994, a surveyor charted land in North Carolina's Blue Ridge Mountains,

the work is time-consuming and exacting.

On this day, however, he saw more than the topography of the landscape.

In the snow, the surveyor found the body of a middle-aged man.

It was completely nude. There was two obvious gunshot wounds, one to the neck and one to the head of the victim.

It was clear this was an execution-style killing perpetrated by a professional.

The primary reason that clothing would be removed from a body out of crime scene

would be to get rid of any trace evidence.

But the killer left one potential clue.

A few feet from the body, investigators found a 16-inch piece of black electrical tape.

It appeared to have a small hole in it that would be consistent with a gunshot hole,

some red droplets which we later confirmed to be blood and some human head hair on the piece of tape.

Apparently, the tape had been used to gag him.

The blood and hair were from the victim.

A check of missing person's reports identified him as 40-year-old Victor Gunnerson,

a Swedish citizen who had been living in the United States for the last several years.

Gunnerson was well known to international law enforcement.

A few years earlier, he was the chief suspect in one of the greatest unsolved murder cases of the 20th century.

The assassination of Swedish Prime Minister Olaf Palma.

...