MILAN  The two friends, both performance artists, hatched the idea about a year ago: wearing white wedding dresses, they would hitchhike from Italy to the Balkans to the Middle East to send a message of peace and “marriage between different peoples and nations.”

But the message delivered by their performance piece was mostly sad and raw. After just three weeks on the road, one of the two Italian artists, Pippa Bacca, 33, was killed by a driver who offered her a ride.

Her naked body was found on April 11 in some bushes near a Turkish village after a suspect led investigators to the site. Although an official cause of death has not been given, local Turkish authorities said Ms. Bacca had been raped and strangled.

The killing has stirred broad public anger and grief in Turkey and Italy. Still, what Ms. Bacca would have wanted, her family and friends said, was her message of peace to live on.