The ex-girlfriend of 49ers linebacker Reuben Foster has submitted a video to prosecutors to support her statement that she lied when she told authorities Foster had hit her.

But Santa Clara County prosecutor Jim Dermertzis said Monday that the district attorney’s office will continue to prosecute a domestic violence case against Foster even if his ex-girlfriend, Elissa Ennis, does not cooperate with the investigation.

But “if the evidence independent of the victim in a domestic violence case is compelling, it’s the prosecution’s duty to seek justice,” he added.

Prosecutors say Foster attacked his girlfriend in February at their Los Gatos home, leaving her bruised and with an injured eardrum. The 28-year-old woman told responding officers that Foster dragged her by her hair, physically threw her out of the house, and punched her in the head eight to 10 times.

Dermertzis refused to discuss the content of the video, but Ennis has said through her attorney that she had footage that shows Foster did not cause the injuries that led to the domestic violence charges against him.

Ennis’ attorney, Stephanie Rickard, last week issued a statement on Ennis’ behalf saying her injuries were the result of a fight with another woman, and that Foster tried to end his relationship with Ennis after he learned of the fight.

Viking receiver suspended

The NFL has suspended Vikings receiver Cayleb Jones for four games after he violated the league’s performance-enhancing drug policy.

He won’t be available for an NFL regular season game until Week 5, which starts Sept. 28 for the Vikings. Earlier this month, linebacker Kentrell Brothers was suspended four games for violating the performance-enhancing drugs policy.

He’s the brother of Bills receiver Zay Jones, who was reportedly arrested in March for felony vandalism. Zay Jones was seen on a video obtained by TMZ Sports struggling with another man, identified by the site as Cayleb, and reportedly trying to jump out of a 30th-floor window until police arrived.

Extra points

The head of team security for the Buccaneers is investigating an online threat made against general manager Jason Licht, a source confirmed to ESPN Monday.

... The Vikings have exercised their fifth-year contract option on Trae Waynes, a Michigan State alum, and re-signed fellow cornerback Terence Newman, bringing the NFL’s oldest active defensive player back for a 16th season that will begin five days after he turns 40.

... The Steelers released veteran safety J.J. Wilcox.