ABC News July 31, 2015

MH370 Probe: Man Describes Finding Piece That Could Unravel Missing Jet Mystery

WATCH: Haunting Clues From Piece of Debris Thought to Be From MH370

Johnny Begue and his friend were out looking for stones earlier this week on Reunion Island when he stumbled upon a piece of an airplane wing washed up on the sand.

"I asked my friend to come help pick it up. First we thought that we'd use it as a piece of decoration and then we thought because it's a piece of plane, we should probably call the police,” Begue, 46, told ABC News today.

MH370 Probe: Part Number on Debris from Indian Ocean Consistent With 777, Official Says MH370 Search: Tattered Suitcase Recovered Near Washed-Up Wreckage MH370 Search: A Look at the Plane Part That Was Found

The piece was discovered on Wednesday by Begue and may be the first item anyone has seen of the doomed Malaysia Airlines Flight 370, which disappeared in March 2014 with 239 people on board. Investigators are treating the airplane part, believed to be a "flaperon," as a major lead into the disappearance of the plane.

Reuters
French gendarmes and police carry a large piece of plane debris which was found on the beach in Saint-Andre, on the French Indian Ocean island of La Reunion, July 29, 2015.

Based on a part number that was visible in pictures, Boeing workers believe it came from a 777, the same type of plane as MH370, according to a U.S. official. MH370 is the only missing 777 jet in the world.

Begue is still getting used to the significance of the find.

"I feel like maybe it's God that sent me, I was just looking for a stone and now I think maybe God sent me so that the people that have lost their loved ones can grieve properly".

Andrew Meldrum/AP Photo
Johnny Begue, 46, who says he found the piece of aircraft debris that is being investigated, is interviewed by The Associated Press in Saint-Andre, on Reunion Island, July 30, 2015.

In the wake of the discovery, a tattered piece of luggage on the same beach.

The origin of the piece of luggage has not been determined, but it was seized by local police for examination.

French officials said the plane part will arrive over the weekend in Toulouse, where it will undergo analysis next week.

ABC News' Sifiso Khanyile contributed to this report.

Get real-time updates as this story unfolds. To start, just "star" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here. To be notified about our live weekend digital reports, tap here.