The termination stems from personnel turnover at the firm.
The plan is seeking a firm to handle its $511.5 million domestic small-cap value equity option.
The pension system approved minimum qualifications in a search for at least one manager to handle $150 million to $250 million last week.
The retirement system agreed to part ways with an active manager that had been on watch due to lagging performance.
The search will be conducted to replace domestic large-cap value equity manager Hamlin Capital Management, which was terminated last month.
The retirement system is searching for a U.S. small-cap growth equity manager to handle a $40 million mandate.
The plan approved a new domestic equity structure that shifts the portfolio to 100% passive.
The retirement fund added domestic small-cap value and global low volatility equity managers to its watchlist in April.
The retirement system replaced an underperforming U.S. small-cap value equity manager last quarter.
The plan terminated its incumbent mid-cap core manager last month.