Chief Manhattan Assistant District Attorney Daniel Alonso and General Counsel Caitlin Halligan are leaving the office for the private sector in the beginning of the new year.

Alonso will be stepping down on Feb. 1 and Halligan will leave in mid-January. Neither have announced what their next positions will be.

In an interview, Manhattan District Attorney Cyrus Vance Jr., said both Alonso and Halligan “were exceptional managers and assistant district attorneys during my first term.” He later added, “I’ll miss them, but I really wish them well,” adding the office would have “exceptional lawyers taking over.”

Alonso, speaking of his work as a prosecutor, said, “It’s been great. Every day has been a challenge. The vision and energy the new district attorney brought to the office has been inspirational.” He added it has been “such a privilege to help the office continue in the traditions of the previous three administrations.” He noted he “always planned [he] would stay through D.A. Vance’s first term,” saying it has been “a fabulous opportunity” and that Vance has “done an unbelievably great job.”

Karen Friedman Agnifilo, currently serving as executive assistant district attorney and chief of the Trial Division, will replace Alonso. No successor has yet been named for Halligan’s post. Vance announced the moves to the office last week.

John Irwin, currently the deputy chief of the Trial Division, will take Agnifilo’s post as executive assistant district attorney and trial division chief.