Texans owner Bob McNair was questioned for about two hours in a deposition in Houston on Friday.

This marked the latest development in former San Francisco 49ers quarterback Colin Kaepernick's collusion grievance against the NFL.

Kaepernick attended the deposition. McNair wasn't surprised by the former Super Bowl quarterback's presence. This wasn't a confrontational appearance, according to league sources not authorized to speak publicly. Kaepernick worked out in Houston on Thursday, getting in a throwing session and lifting weights.

McNair became the first of many NFL owners and executives to be deposed. Kaepernick's legal team also is expected to question NFL commissioner Roger Goodell, NFL executive Troy Vincent, Dallas Cowboys owner Jerry Jones, New England Patriots owner Robert Kraft, Seattle Seahawks coach Pete Carroll (the Seahawks worked out Kaepernick last season and didn't sign him) along with Baltimore Ravens coach John Harbaugh and general manager Ozzie Newsome.

Still no job for QB

The Ravens were evaluating Kaepernick when Joe Flacco had a back injury, but they didn't sign him, and Kaepernick's girlfriend made fun of former Ravens linebacker Ray Lewis and Ravens owner Steve Bisciotti on social media.

Kaepernick, through his lawyers at Mark Geragos' California-based law firm, is alleging the NFL is colluding to not sign him to a contract.

Kaepernick was the first player to kneel during the national anthem to protest police brutality and racism, which became a major subject of controversy that drew the ire of President Donald Trump on social media and in speeches.

During a private meeting with owners and NFL executives, McNair made a remark last year that the NFL "can't have the inmates running the prison." McNair subsequently apologized and emphasized the comment was referring to employees in the league office, not players.

When Texans star quarterback Deshaun Watson tore his anterior cruciate ligament last season and was placed on injured reserve, the last-place AFC South club signed journeyman Josh Johnson instead of Kaepernick and several other more accomplished quarterbacks. Johnson was later released, and T.J. Yates was signed and stepped in as the starter when Tom Savage suffered a concussion.

Independent arbitrator

Under the NFL collective bargaining agreement, collusion cases are heard by an independent arbitrator appointed by the NFL and the NFL Players Association. Under the rules, no team "shall enter into any agreement, expressed or implied, with the NFL or any other club, its employees or agents to restrict or limit individual club decision-making" negotiations with any player.

Proving collusion is regarded as extremely difficult, according to legal experts.

Kaepernick, 30, filed the grievance in October after going unsigned as a free agent.

Kaepernick last played in the NFL in 2016, when he threw 16 touchdowns with four interceptions for the 49ers before opting out of his contract last year.

For his career, Kaepernick has passed for 12,271 yards, 72 touchdowns and 30 interceptions for an 88.9 passer rating. He also has rushed for 2,300 yards and 13 touchdowns.

By all accounts, Kaepernick looked fit during his workout in Houston and threw the football with good zip and accuracy, albeit without any pass rush to disrupt his throws.