Alexander was a restricted free agent while Kalu and Salaam were each unrestricted. Each player will enter his second year with the Texans.
Alexander (5-10, 190) played in one game for the Texans in 2006, suffering a season-ending knee injury on his first kickoff return in the season opener against Philadelphia. The Colorado State alumnus, who was projected to be the team's primary returner, has 20 career kick returns for 404 yards. Alexander played the first two years of his career in Denver.
Kalu (6-3, 265) finished the 2006 season with 21 total tackles, including 16 solo stops. The former Rice standout finished tied for fourth on the team with 2.0 sacks for 21 yards in losses. In 10 professional seasons, Kalu has 28 career sacks, four forced fumbles, four fumble recoveries and an interception.
Salaam (6-7, 302) joined the Texans after spending the previous two seasons with Jacksonville. Salaam played in 15 games in his first season with the Texans, starting 14 at left tackle. The 10 th-year player out of San Diego State was part of an offensive line that surrendered 25 fewer sacks than the year before.