Los Angeles traded defenceman Nick Ebert to Dallas last month for Campbell, the 11th overall pick in the 2010 draft. Campbell played just one NHL game for the Stars in October 2013, spending most of his career in the AHL.
Goalie Jeff Zatkoff signed with the Kings last week to compete for the backup job behind Jonathan Quick.
Dowd and Forbort were restricted free agents who made their NHL debuts last season. Dowd played five games for the Kings, while Forbort scored two points in 14 games.
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