The team of Saudi agents that killed the Saudi dissident Jamal Khashoggi in Istanbul brought a body double who resembled Mr. Khashoggi and wore his clothes as part of a cover-up, Turkish and Saudi officials said Monday.

Turkey leaked security camera video footage on Monday showing the look-alike strolling the streets of Istanbul shortly after Mr. Khashoggi had been killed inside the Saudi Consulate.

The impostor was easily recognizable in part because he wore different-colored shoes than Mr. Khashoggi was when he entered the consulate. A Saudi official as well as another Saudi briefed on the kingdom’s investigation into the killing confirmed the ruse.

The inclusion of a body double in the squad is the latest indication that the death of Mr. Khashoggi, a Virginia resident and Washington Post columnist last seen on Oct. 2, occurred during a premeditated plot by the Saudis to abduct or kill him and hide what they did.