This article is from the ER FAQ, by Rose Cooper email@example.com with numerous contributions by others.
In "Night Shift" , the troubled Dennis Gant left work
in the middle of a shift and was later brought in as a patient,
having been run over by a train. The implication is that Dennis
was suicidally depressed and deliberately jumped in front of the
There seems to be a little debate about this on the Internet
since we didn`t actually see the event happen, and since the police
ruled the death an accident, but there`s little doubt in my mind that
Dennis` death was a suicide, and I`m sure that`s the way the writers
meant it to come across.