The departure was “surprising and abrupt” and a replacement has not yet been identified.
The plan is looking to hire one manager that is benchmarked against the Russell 2500 Index.
The search follows the plan’s decision to divest its emerging markets equity allocation from Chinese holdings.
The plan will also receive an update in its ongoing domestic small-cap core equity and global fixed-income manager searches next week.
The search is open to North American-focused fund-of-funds managers.
The city first hired its existing investment manager in 2019.
The plan recently terminated three equity managers and made private markets commitments totaling $95 million.
The plan launched two manager searches after approving a new asset allocation last month.
The plan will interview three finalists for a maiden global equity mandate in August.
The search is for senior direct lending managers.