Salih Jahalin, 54, a Fatah operative from the West Bank village of al-Khader near Bethlehem, was released by Israel in 2011 as part of a deal to secure the return of Israeli soldier Gilad Shalit, who had been held captive in Gaza for more than five years.
Jahalin's body was discovered by Jordanian authorities Monday, Ynetnews.com reported. A sack containing drugs or explosives was found next to the body, the report said.
Jahalin was arrested by Israel in 2006 for allegedly smuggling weapons to terrorists and was sentenced to nine years in prison, the Israeli website said.
It was unclear how Jahalin died, the report said. Palestinian sources said he had apparently planned to swim with the sack to the Israeli side of the Dead Sea and smuggle its contents into the West Bank.