S-Corp Dividend Rules when Retiring Part Way through a year

Are S Corp dividends linearly distributed, ore required to be distributed, over the tax calendar year (assume Jan 01-Dec 31)?
Example: employee retires July 01, but corporation dividends are typically distributed in Aug and Dec of any given year. Will the retiree collect 50% of those Aug and Dec dividends since he worked 1/2 the year? Or do dividends cease upon separation date?