Simelane’s journey began at 5am on March 7 when the homeless criminal boarded the No 9 bus in Birmingham city centre, armed with a kitchen knife.
At 6am the driver approached Simelane to have the second of three brief conversations he would have with him that fateful morning, after completing the route between Birmingham and Stourbridge via Halesowen.
At around 7.15am Christina began her usual short walk from her home in Ladywood to catch the No 9 at the top of Broad Street.
CCTV shows the teenager boarding the bus that Simelane was already on at 7.30am.
Police say the attack was so spontaneous and random that nobody had realised what had happened in the six minutes between her boarding the bus and the moment she was stabbed.
Simelane is next seen on a downstairs camera, casually waiting for the bus to stop.
He has one more final brief exchange with the driver, who asked “what is all the fuss about upstairs?
Simelane responds with: “I think it’s a row about a Daysaver ticket,” before casually stepping off the bus and walking away before anybody realises what has happened.
Shortly after the killer steps off the bus, the downstairs passengers start to realise what has happened upstairs and the first call is made to police at 7.37am.