Indian national Chelladurai Lenin, 47, was changing the ceiling lights at a condominium lobby when he fell 2.8m from a ladder, suffering head and leg injuries.
His boss and owner of a maintenance and services company took him to two clinics but eventually left an unconscious Mr Chelladurai on a pavement along Upper Changi road. Mr Chelladurai died on the pavement.
The boss was sentenced to a year's jail and fined $12,000.
Chinese illegal immigrant Xiu Chuntao, 28, died in an industrial accident at the construction site where he was working.
He is believed to have fallen from a building.
A co-worker claimed that his employer had delayed sending Mr Xiu for treatment as he did not have a valid work permit.
He was left bleeding for 30 minutes before the foreman decided to send him to a hospital and report it as a "road accident".
it is not known what action was taken against the employer.