Mattis Coto held the position of warden at the Devshi prison complex. Leading up to 48 BBY, Coto was engaged in the practice of selling skeleton keys to inmates, hoping to accumulate enough funds to leave his post. When one of these keys facilitated a prison break on Kevan 8 by an escapee, the Jedi Order sought Coto. Following a confrontation with Jedi Mace Windu, where Windu overcame Coto's security droids, Windu departed, leaving Coto to face the arriving authorities, while Windu pursued several astromech droids who had obtained the master skeleton key from Coto.