NORTH HILLS (CBSLA) — One person was killed and a second injured in a rollover crash off the southbound 405 Freeway at Roscoe Boulevard in North Hills.

Speed may have been a factor in the 3:20 a.m. crash that left a vehicle on its side down an embankment below the Roscoe Boulevard onramp.

One person who was “presumed to be have been living on the embankment beside the freeway” was pronounced dead at the scene, according to the Los Angeles Fire Department. The driver was initially trapped, but has since been freed and taken to a hospital in unknown condition.

One lane of the southbound 405 Freeway and the Roscoe onramp was closed during the fatal crash investigation. All lanes were reopened just after 7 a.m.