Australian billionaire James Packer was refused entry into his own casino by a security guard in Melbourne.
The Herald Sun reports the ugly altercation began when Crown Casino security guard Dr Iskandar Chaban denied Packer and senior Crown colleague Ishan Ratnam entry into the casino.
Both men are reported to have shouted abuse at Chaban, pushed him and demanded he be sacked on the spot.
Chaban collapsed on his way home and was hospitalised.
He told the Herald Sun: "I was just doing my job."
Crown Casino suspended Chaban as a result of the incident but later reinstated him following a routine inquiry.