'I am sorry from the bottom of my heart'published at 11:51 BST 4 June
In his letter, which Webster says indicates a "lack of literacy", Zulkernain Ahmed says: "I am sorry from the bottom of my heart.
"I regret the actions I took that day, I wish time to turn back. I would change so many things.
"I am sorry to Abdullah's family, every day I pray for them for things to get better for them. I cry every night knowing it was me. I wish I could make things better."
Ahmed goes on to say that he has learnt CPR and chest compressions since being in prison in the hope he can "make a difference" in future.



