There were also services for Floyd in North Carolina and Minnesota.
Floyd was killed by a police officer in Minneapolis on May 25.
O'Brien and Watt were also joined by former Texan and current Cincinnati Bengals defensive lineman, D.J. Reader. Texans owner Cal McNair, offensive coordinator Tim Kelly, defensive coordinator Anthony Weaver and executive vice president of football operations Jack Easterby were also present.
For JJ Watt, it's just the latest notch in his belt in the Houston community. During Hurricane Harvey in 2017, Watt became renowned for his relief efforts, raising millions of dollars to help those affected by the natural disaster.
His charity work in general has been well-documented, so it's not the least bit surprising that he was in attendance to honor Floyd on Tuesday.
Protests have broken out in just about every major city across the country since Floyd's death, with people of all races fighting against police brutality and urging for reform.
Of course, athletes across all different sports from different races, ethnicities and backgrounds have been very vocal on the subject, with some even leading protests in certain cities.
The Texans are coming off of a 2019-20 campaign in which they won 10 games and captured the AFC South division title, marking their fourth division crown in five years. They went on to fall to the Kansas City Chiefs in the Divisional Round of the playoffs.