NFL assistant coach Chris Foerster has resigned after video of him snorting a white powdery substance from his desk emerged on social media.
The Miami Dolphin's offensive line coach released a statement just hours after the clip surfaced on Facebook and Twitter to confirm he was leaving the franchise and would be seeking professional help.
"I am resigning from my position with the Miami Dolphins and accept full responsibility for my actions," he said.
"I want to apologise to the organisation, and my sole focus is on getting the help that I need, with the support of my family and medical professionals."
The 55-year-old has been among NFL coaching circles since 1992 and joined the Adam Gase-led side in Miami last year.
Gase said he learned of the video on Monday night (NZT) and immediately contacted Foerster.
"He's disappointed, he's upset, he's mad at himself," Gase told the Associated Press.
"It's not fun, especially when you're close to somebody. But you've got to take the next step and move on."
"Since I've been around him, he has always been a guy who just put his head down and worked. He was here at 4 in the morning and worked as hard as he could for us."
In the video, Foerster can be seen snorting the substance through a rolled up $20 note while talking into a camera.
"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 powder though the note, commenting on "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."
The NFL are believed to be currently conducting their own review of the matter.