To make room on their roster for the three, the Dolphins waived wide receiver Kerry Reed and center Johnathan Ingram, and placed guard Drew Mormino on injured reserve with a shoulder injury.
Mormino is the only one of this year's 10 draft picks not to be on the 53-man roster.
After spending his entire rookie season on the Chargers' practice squad in 2005, Camarillo played in four regular season games and one playoff contest last year, all in a reserve role. He recorded three tackles on special teams in the regular season and one in the postseason.
Lekkerkerker, like Camarillo, joined San Diego as an undrafted college free agent in 2005. After spending the first half of his rookie season on the Chargers' practice squad, he was activated to the 53-man roster for the final eight contests, although he did not see any action. In 2006, the 6-7, 323-pounder played in 15 regular season games with San Diego, all in a reserve role.
Finally, Mruczkowski was originally signed as an undrafted college free agent by New England in 2003. After spending his rookie season on the Patriots' Non-Football Injury list with a leg injury, he appeared in a total of 18 regular season games, in addition to four playoff contests, over the past three seasons with New England.
In addition to the moves on the active roster, the Dolphins signed four players to the practice squad. All of them were among the final cuts: tight end Aaron Halterman, safety Tuff Harris, guard Marquay Love and offensive tackle Julius Wilson.
They will join wide receiver Marvin Allen, who is an International Practice Squad player who doesn't count against any roster limit but also can't be activated all season.