Story highlights The plane was flying from Johannesburg to London

A second man, who was hiding in the undercarriage of the plane, was injured

(CNN) A stowaway on a British Airways jet was found dead after falling on a roof as the plane approached London Heathrow Airport, authorities said Friday.

It's unclear whether the man had crouched in the wheel well, a common hiding place for stowaways.

A second man who was hiding in the undercarriage of the plane was hospitalized with injuries, the airline said.

The plane was flying from Johannesburg to London when the man fell and landed above a business in Richmond, southwest London. Johannesburg and London are about 6,000 miles apart, and the flight is nearly 12 hours long.

Airline tracking website FlightAware.com lists British Airways Flight 54 as a Boeing 747. It departed Johannesburg on Thursday night and arrived at Heathrow at 7:26 a.m. London time Friday.

Read More