As a former member of the Ulong team, LaGrossa was seen as too strong a threat by the Koror team to the continuity of their strategy.
Ian Rosenberger won the immunity challenge by being the first person to break five ceramic tiles in a coconut-throwing contest.
Merced resident Katie Gallagher, along with the other contestants, paid $220 to get a packet of letters from home.
Six contestants remain. The $1 million-prize winner will be revealed May 15 on the show's season finale.
