The incident occurred on March 21 when the victim, identified as Serge Fournier, 74, encountered Bishop as he was exiting the bus with his walker.
Witnesses claim that as he walked, he passed a woman who had allegedly been cursing at various other passengers and asked her to be nicer.
Video shows what happened next: a woman shoved the 74-year-old man off the bus.
He later died from his injuries.
An elderly man was pushed off a Las Vegas bus and died several weeks later due to injuries he sustained.
Homicide detectives are seeking assistance in locating any individuals who were present during the incident.
Fournier "was pushed with enough force that he never touched any of the steps", the arrest warrant stated.
Police said when they were called to the scene the man refused help, instead taking himself to hospital later that night.
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Police said she was seen in the security video, which has yet to be released, walking away holding the boy's hand.
On April 23 his death was ruled as a homicide by the county coroner.
His neighbour Trevor Taylor paid tribute to the victim, telling KSNV: "He was an excellent neighbour".
"He wasn't able to eat", said Fournier's neighbor, Jeffrey Bingham, CBS affiliate KLAS-TV reported.
Police found and arrested Bishop three days later.
Cadesha Bishop was arrested on May 6, 2019, according to inmate records.
She's facing charges of open murder on an elderly-vulnerable person. A Clark County public defender's official did not immediately respond Thursday to messages.