Leonardo DiCaprio covers his face with a cap and protective face mask on ... trends now

Leonardo DiCaprio covered his face with a cap and a protective face mask as he stepped out for a cycle in New York City on Saturday. 

The actor, 48, attempted to fly under the radar in the LA Dodgers headwear with his long hair peaking out from underneath. 

He wrapped up warm in a navy padded coat, which was worn on top of a blue T-shirt and straight leg jeans. 

To complete his casual ensemble, Leo slipped on a pair of smart leather trainers before hopping on a public Citi Bike. 

He rode through the busy streets after enjoying lunch at upscale Italian restaurant Cipriani Downtown. 

Leo's new movie Killers of the Flower Moon is set for release next month and explores the harrowing true story of the 'reign of terror' that left two dozen Native Americans dead.  

The blockbuster, which is due to be released in May, is based on the 2017 non-fiction book of the same name written by David Grann. 

Set in the 1920s, it centers on the FBI's investigation into a string of murders after several members of the Osage tribe in Oklahoma were slaughtered. 

But as film fans get ready for the crime drama to reach their screens, FEMAIL looks back at the horrific true story.

Killers of the Flower Moon focuses on a little-publicized chapter of American history involving the Osage Nation.

In the 1920s, the Osage tribe became wealthy almost overnight after oil was discovered beneath their land, earning them more than $30 million in annual revenue at the peak of the boom, according to the Oklahoma Historical Society.

Subsurface minerals within the Osage Nation Reservation were tribally owned and held in trust by the government. 

Mineral leases earned royalties that were paid to the tribe as a whole - with each allottee receiving one equal share also known as a headright.

But these headrights could only legally be attained by outsiders if they married into the tribe.

It was during this time that

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