The force did not reveal the details of the abusive behaviour that led to Wilkinson being sacked.
It said after his arrest in 2023 he was immediately suspended.
Wilkinson had worked on murder cases and large scale drugs conspiracies including those resulting from the Encrochat encrpyted phone network hack.
Det Ch Supt Sabi Kaur, head of the force’s Professional Standards Department, said: “We expect the highest standards at all times from our officers and staff and when their actions fall below those standards we will take swift and effective action.
“We will not allow the unacceptable actions of individuals to damage the good name built up by the vast majority of our officers and staff who do an exemplary job to ensure that all of our communities are protected.”