Mobile phone footage shows the moment teenager Coral Millerchip began kicking and hitting an 80-year-old man in Coventry city centre.
The video shows the man try to defend himself against the attack, but she kicks him and pushes him to the floor as friends cheer her on.
The man later died in hospital.
Millerchip, aged 19, was today jailed for a total of 44 months.
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Remaining dry overnight with lengthy clear periods.
Leah Washington, 17, had to have her left leg amputated after being trapped for hours on The Smiler rollercoaster at the theme park.
Fine and dry this evening and overnight with showers on Sunday afternoon.