Miami Dolphins head coach Adam Gase talks to reporters during a news conference, Monday, Oct. 9, 2017, in Davie, Fla. Gase says he learned hours after the team's latest game about a video on social media that appeared to show offensive line coach Chris Foerster snorting three lines of a white powdery substance at a desk. Gase says he can't describe his reaction, but says Foerster apologized to him before resigning Monday. (AP Photo/Alan Diaz)

DAVIE, Fla. - Miami Dolphins coach Adam Gase says offensive line coach Chris Foerster seemed so focused on the team that he would often be at work by 4 a.m. Then a video surfaced that rocked Foerster's reputation and cost him his job.

The 55-year-old assistant coach resigned Monday, apologized and said he was seeking medical help after a video on social media appeared to show him snorting three lines of white powder at a desk.

Hours after the video was posted on Facebook, Foerster announced his departure in a statement released by the team.

"I am resigning from my position with the Miami Dolphins and accept full responsibility for my actions," he said. "I want to apologize to the organization, and my sole focus is on getting the help that I need, with the support of my family and medical professionals."

The 56-second video was first posted to the Facebook page of model Kijuana Nige on Sunday night. It's unclear when and where the video was shot, and it was deleted Monday.

"Since it's NFL Sunday let's talk about these coaches folks," Nige wrote in the post. "Introducing Christopher Foerster Miami Dolphin offensive line coach."

Foerster has been an NFL assistant since 1992 and joined Gase's staff in Miami last year.

"We were made aware of the video late last night and have no tolerance for this behaviour," the team said in a statement that accompanied Foerster's resignation announcement. "After speaking with Chris this morning, he accepted full responsibility and we accepted his resignation effective immediately. Although Chris is no longer with the organization, we will work with him to get the help he needs during this time."

Gase said he learned of the video late Sunday, soon after the Dolphins' 16-10 victory over Tennessee.

"I don't think I can say what my reaction was," Gase said.

The coach said he phoned Foerster, who apologized. Gase declined to say whether Foerster volunteered to resign or was urged to quit.

"He's disappointed, he's upset, he's mad at himself," Gase said. "It's not fun, especially when you're close to somebody. But you've got to take the next step and move on."

The NFL said it was reviewing the matter.

Gase said he has known Foerster since 2008, when both were assistants with the San Francisco 49ers. Foerster joined the Dolphins shortly after Gase became head coach last year.

"Since I've been around him, he has always been a guy who just put his head down and worked," Gase said. "He was here at 4 in the morning and worked as hard as he could for us."

Rookie Eric Smith was the only offensive lineman to speak to the media Monday.

"I have nothing negative to say about coach Foerster," Smith said. "It's an unfortunate situation. I hate to see it happening to him. I saw no signs of it happening. I'm still shocked by it."

Team captain Michael Thomas said he had not seen the video but expressed sympathy for Foerster.

"It's crazy," Thomas said. "We're praying for him."

The video appears to show Foerster and the powder on the desk. The man is holding a rolled-up $20 bill in his right hand and appears to adjust the camera with his left hand.

"Hey babe, miss you, thinking about you," he says. "How about me going to a meeting and doing this before I go?"

He then snorts the substance into his nose though the $20 bill and notes "those big grains falling" as residue lands on the desk.

"What do you think, I'm crazy?" Foerster asks after snorting the second line. "Ah, no, babe.

"It's going to be a while before we can do this again ... " he says, "But I think about you when I do it. I think about how much I miss you, how high we got together, how much fun it was. So much fun."

Before snorting the final line he says, "Last little bit before I go to my meeting."

"Those are his habits," Nige wrote in a different Facebook post, "and he recorded himself and sent it to me professing his love."

Foerster's offensive line has played poorly this season, and the Dolphins (2-2) rank last in the league in points and yards per game. They planned an announcement later regarding his successor.

"Any time you lose a really good coach, it's not ideal," Gase said. "But we'll rally. We'll find a way."

Quarterback Ryan Tannehill suffered a season-ending knee injury in training camp, Miami's opener was postponed because of Hurricane Irma, and linebacker Lawrence Timmons briefly went AWOL. Foerster's departure becomes the latest chapter in a turbulent season.

"That's the NFL, man," Gase said. "It's a league of distractions. You move on."

___

AP Sports Writer Jake Seiner in New York contributed to this report.

___

For more NFL coverage: http://www.pro32.ap.org and http://www.twitter.com/AP_NFL

___

Follow Steven Wine on Twitter: http://twitter.com/Steve_Wine

News from © The Associated Press, 2017