He played in Major League Baseball (MLB) from 2006 to 2012 for the Arizona Diamondbacks, Washington Nationals, and Pittsburgh Pirates.

[4] In 2007, Slaten appeared in 61 games for the Diamondbacks and recorded a 2.72 ERA,[4] helping the team finish atop the National League West division.

He pitched in three games of the 2007 National League Championship Series, allowing no earned runs in 1+1⁄3 innings.

On April 29, 2012, in a game between Indianapolis and the Durham Bulls, Slaten pitched the final inning of a combined no-hitter.

[8] On May 28, Slaten was called up and pitched in 10 major-league games, until June 27 when he was designated for assignment to make room for minor-league waiver-claim Oscar Tejeda on the roster.

[4] Overall, in 216 major-league pitching appearances (all in relief) in seven seasons, Slaten posted a 3.52 ERA while striking out 110 batters in 150+2⁄3 innings.

[citation needed] Slaten died in Palm Beach Gardens, Florida, on October 4, 2016; he was survived by a daughter.