"As of right now, we have an investigation," public information officer Kenia Reyes told NFL Media.
Reyes classified the investigation as in "the early stages." No charges have been filed.
Kaepernick addressed the story Friday morning on Twitter.
"I want to thank all of the people who have shared their encouraging sentiments. I assure you that your faith is not misplaced," Kaepernick wrote.
The Seahawks released the following statement regarding Lockette: "We are aware of the situation, monitoring it closely and will not have any further comment at this time."