Alastair Hall, the European head of OMERS Infrastructure, has resigned. He was deeply involved in the firm's investment in Thames Water, which resulted in a complete write-down of its $1.3 billion investment. Hall's departure follows a period of scrutiny for the Canadian pension fund's infrastructure arm, particularly regarding its UK investments.

This resignation is a significant development for OMERS. The firm is a major player in infrastructure investments globally. Hall's exit raises questions about the fund's strategy and oversight, especially in Europe, where it has substantial holdings. Investors will likely be watching closely for any changes in investment approach.

The Thames Water investment has been a major challenge for OMERS. The utility has struggled with debt and operational issues, leading to the write-down. The departure of a senior executive involved in this deal suggests internal reviews and potential shifts in leadership. What's next is a review of existing investments and future strategy.

OMERS Infrastructure manages a substantial portfolio of assets. Without a clear succession plan, Hall's departure could lead to instability. The firm's next steps will be critical. It must reassure investors and demonstrate a clear path forward for its European investments, as well as a new leader.