Law360, New York (May 18, 2015, 6:27 PM EDT) -- On May 18, 2015, the Supreme Court of the United States confirmed the existence of an independent duty on the part of ERISA plan fiduciaries to continuously "monitor" retirement plan investments and remove those that are imprudent. In Tibble v. Edison International, the court held that ERISA's six-year statute of limitations for breaches of fiduciary duty does not extinguish claims alleging imprudent selection of investments if a continuing "duty to monitor" those investments is violated within the limitations period. The court thus breathed life into stale claims about investment selection by recognizing a fiduciary's continuing obligation to "monitor" investments and investment options. But the opinion stopped short of defining the precise contours of the "duty to monitor," leaving the development of the obligation to case-by-case evolution....