A man was struck and killed by a Richmond-bound train at MacArthur station at around 6:50 p.m Monday

Any additional information about this?
Was this a fall, suicide, or murder?

http://abclocal.go.com/kgo/story?section=news/local/east_bay&id=8560919

I thought the reporting on this fatality was rather vague as well and am wondering how that happened.