A Lanham man was killed Wednesday morning after he was rear-ended twice on the Capital Beltway — the second time by a tractor-trailer with no trailer attached, authorities said.

The deadly sequence of events that shut down westbound I-495 for nearly five hours started about 5:15 a.m., when a woman in a 2007 Nissan Sentra rear-ended a 1997 Toyota Corolla just before New Hampshire Avenue, police said.

The driver of the Sentra, a 31-year-old White Hall, Md., woman — was not hurt and pulled her car onto the shoulder, according to police. The Corolla stayed in the roadway, police said.

It remains unclear why the Corolla did not move, police said. But moments after the Sentra pulled out from behind it, the tractor-trailer crashed into the Corolla’s back, sending it spinning around on the Capital Beltway.

The man inside the Corolla , 44-year-old Kwame Abban, was transported to a nearby hospital, where he was later pronounced dead, police said.

The truck’s driver was not injured, police said.

Police said all those involved in the crash appeared to have been wearing seatbelts, and investigators are still working to determine how fast everyone was traveling.

No one has been charged or cited in connection with the incident, police said.