John Mooner claims to have had a close encounter of the third kind the bizarre humanoid in the park in Newton Abbott, Devon, on Monday this week.
Mr Mooner, who runs the website worldufophotosandnews.org, claims the being resembled a “classic alien grey” and was hostile towards him.
He told the Herald Express local newspaper: “I was doing some paranormal investigation looking for anything out of the ordinary and I had just walked around the woods when I saw someone standing there in the park.
“It was as I got closer that I realised that it was no man.
“I had the shock of my life it was a grey alien. The grey alien was just standing there blocking the way I was heading.
“I fumbled around with my pocket camera and quickly took a photograph before the AA batteries fell out of the camera’s batteries compartment.”
He said there was no time to get another snap because the creature appeared to turn nasty.
He added: “There was no time to pick up the batteries to take another photograph as the grey alien was now looking right at me.
“It had the classic looking black eye which freaked me right out.
“The grey alien then started floating in my direction. I jump back in fight and quickly turn around and started running like hell back through the woods.”
Mr Mooner claimed after running some distance he began coughing up blood.
John says he ‘ran for miles’ before he started unaccountably ‘coughing up blood’.
The paranormal investigator claims to have previously snapped eight UFOs over his hometown.
Sceptics have said the image looks like a CGI fake.