The plan interviewed three domestic small-cap growth equity managers in August for the mandate.
The investment officer is retiring this week after nearly 20 years with the city.
Wealthspire Institutional was first established last year through the combination of five entities.
The plan also terminated an international large-cap growth equity manager.
The retirement association will also consider rehiring its general investment consultant this week.
The retirement system last conducted a similar search in 2016.
The retirement system will receive potential international equity candidates next month.
The retirement system made $60 million in total commitments at a board meeting this week.
The new manager will handle a mandate of up to $250 million.
The retirement system closed on more than $500 million in commitments last month.