retired the number
... that the San Diego Chargers retired the number of Junior Seau posthumously at his memorial?
... that the <a href="./San_Diego_Chargers" id="mwD_4" rel="mw:WikiLink" title="San Diego Chargers">San Diego Chargers</a> <b id="mwD_8"><a class="mw-redirect" href="./San_Diego_Chargers_retired_numbers" id="mwEAA" rel="mw:WikiLink" title="San Diego Chargers retired numbers">retired the number</a></b> of <a href="./Junior_Seau" id="mwEAE" rel="mw:WikiLink" title="Junior Seau">Junior Seau</a> posthumously at his memorial?