Rudakubana was born in Cardiff to Rwandan parents in 2006, and moved to the Southport area in 2013.
He took acting classes at the Pauline Quirk Academy and appeared in a promotional video for BBC Children in Need in 2018, which has since said it had no affiliation with him.
The BBC removed the video from its websites in the wake of the Southport attack.
Neighbours on the street where he and his family lived in Banks, West Lancashire, about 6 miles (9km) from Southport, have told the BBC that the police visited the home on several occasions in the months leading up to the Southport attack.
On the day of the attack, a doorbell camera caught him pacing outside of his family home, before catching a taxi to the dance studio where he would carry out the stabbings.
Bebe King, 6, Elsie Dot Stancombe, 7, and Alice Dasilva Aguiar, 9, were all killed.
Initially, not guilty pleas were entered for Rudakubana, after he refused to speak during a hearing, but these changed to guilty on Monday, the first day of his trial.
He is due to be sentenced on Thursday and is expected to be given a life sentence.
However, he cannot be sentenced to a whole-life term for his crimes because he is under the age of 21.
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