An IG-86 sentinel droid participated in the Senate hostage crisis. It was part of Cad Bane's crew when they went to break Ziro Desilijic Tiure out of prison. The droid was destroyed during the Senate hostage crisis that followed, as an unarmed Anakin Skywalker destroyed the droid, whose body was found by fellow bounty hunter Shahan Alama.
The sentinel droid using its searchlight
The IG-86 sentinel droid was a member of Cad Bane's team on his two-part mission to free Ziro the Hutt. Bane needed a bargaining chip, so he and his crew of bounty hunters invaded the Senate Building, first killing the Senate Commandos outside. They entered the building and blasted their way into a control room where they shot and killed everyone inside, including a Senate Commmado, a blue Senate protocol droid, a Senate astromech, a LEP-series service droid, and a WED-15 Treadwell droid. They then took some senators hostage. Anakin Skywalker was seen by the sentinel droid, but since Senator Padmé Amidala had his lightsaber, he was forced to fight the droid with other means, such as tossing it with the Force and attacking it with whatever he could find. He smashed the droid's head off and left its mangled body on the floor, where it was found by Shahan Alama. Noticing the lack of lightsaber cuts, Alama went to tell Bane that the Jedi was unarmed.