Fletcher Gray, who now heads the Houston branch of the Mutual UFO Network (MUFON), says the case of a triangle UFO he investigated has left him baffled.
In December Express.co.uk ran a series of articles about an increase of so-called triangle UFOs in the states.
Houston MUFON receives around 80 suspected UFO sightings a year, but most can be explained said Mr Gray.
But, he investigated a case of a triangle UFO sighting in Dayton Hill, Houston, last year, that he cannot talk away.
And, it could have been alien in origin, he feels.
He said: “The universe is too big for us to be alone.”
Mr Gray said a witness had told him on a triangular UFO seen above the Highway 1960 near Dayton, Houston, that “defied gravity.”
He said: “It spanned all the way to that tree line over there.”
The man told him the UFO was hovering before it disappeared.
He said: “I spent 27 years in law enforcement. I know when a person is lying, leading me on.
“I don’t think he was.”
He speculated what it could have been, saying: “They’re seeking out and learning our planet, if that’s the case.
“It could be something they are doing research with, something that has antigravity capabilities. If it’s a UFO, it’s a baffler.”
The US-based MUFON global database of UFO sightings receives hundreds of similar reports each year, with numbers seemingly on the rise.
The reports are often eerily similar, leading to speculation the bizarre UFOs could be REAL.
Many reports tell of a silent triangle shape, defined by a series of lights, that are said to be in some cases as big as a football field, moving slowly across the sky.
The most infamous mass triangle UFO sighting was the Phoenix Lights incident of March 13 1997 over Arizona.
Five lights were seen in a formation by thousands of people over three hours from 7.30pm to 10.30pm.
The sightings took place a cross a 300-mile area from Phoenix to Tucson.