Police in Las Vegas have released shocking surveillance footage showing the moment a woman violently pushed an elderly passenger off a bus to his death as she now faces murder charges.  

Serge Fournier was reportedly telling the unruly woman on the bus to be nicer to other passengers after she was heard cursing when he was shoved off the vehicle and landed head first on the sidewalk. 

Video shows the 74-year-old being shoved down the steps of the public transit bus and smashing his face on the concrete ground.

In the CCTV clip taken from the bus's security cameras, a woman can be seen talking to Fournier as he walked past carrying a walker and heading towards the door.

Then as his back was turned she violently shoved him with both hands, sending the elderly man crashing down the steps. 

Cadesha Michelle Bishop was arrested on a murder warrant last Monday after he died in hospital of his injuries. 

Bishop was allegedly yelling and swearing at others on the bus when Fournier asked her to stop during the March 21 incident at around 4.50pm. 

Fournier initially survived but spent a month in hospital before he succumbed to his injuries, KSNV reports.  

Clark County coroner ruled his death was a homicide resulting from his injuries on April 23. 

In police documents Bishop is accused of shoving Fournier out the door 'with enough force that he never touched any of the steps' before hitting his head about eight feet (2.4 meters) from the bus.

Las Vegas Metropolitan Police Department released footage of the altercation on Tuesday in an appeal for more witnesses to come forward.

© Provided by Associated Newspapers Limited Serge Fournier hit his head on a sidewalk during the incident and the Clark County coroner ruled his death a homicide resulting from his injuries a month later A police report says Fournier was moving up the aisle of the Regional Transportation Commission bus when he asked a woman who had been cursing at other people to be nicer to passengers, the Las Vegas Review-Journal reported. 

A judge ordered Bishop, 25, to be held on $100,000 bail pending a preliminary hearing of evidence May 21. 

'No matter what his age, she should not have done that. People need a little more patience than what they have these days,' said the man's neighbor, Trevor Taylor. 

Taylor asserted that Fournier was a 'wonderful person' and shared that he would never forget his friend. 

'He was an excellent neighbor. Very nice, religious person,' he added. 

© Provided by Associated Newspapers Limited Fournier reportedly told a woman to stop shouting and cursing at fellow passengers as he walked down the aisle of the Regional Transportation Commission bus on March 21 Fournier leaves behind a wife, who is disabled. 

'I know it caused several financial problems for his wife,' said Ken Mallen, who was familiar with the couple. 

The Las Vegas Sun reported that Bishop was identified in part by a 'Love' emblem on her jacket and her son's distinctive Spider-Man backpack. 

Police said she was seen in the security video, which has yet to be released, walking away holding the boy's hand.

Court records show that Bishop was convicted twice, in 2014 and 2015, of misdemeanor domestic battery charges.