accessorily
adv. manner C2 Proficiency ac·ces·so·ri·ly
adv. in a way that helps or supports someone else, especially in a crime. It describes being involved in a situation without being the main person doing the action.
adv. in a manner that provides assistance or support to another person, particularly in the commission of a crime. Often used in legal contexts to describe secondary liability.
He was found guilty of the crime accessorily.
The court ruled that the defendant acted accessorily by providing the tools used in the robbery.
While the primary perpetrator was absent from the scene, the prosecution argued that the defendant acted accessorily by orchestrating the logistics of the heist from a remote location.
From accessory + -ly.