She said: “My heart is broken and I will always miss him.
“The devastation that was caused will never go away. I just wish I could have one more day with him.”
Connor, who has two brothers and two sisters, was attacked in his flat in Fairacres Road, Oxford, and suffered wounds to his chest, stomach, arms, back and buttocks.
It emerged during the trial that Blencowe did not even know his victim, only having briefly met him once, and had to ask a mutual friend where he lived.
He took a taxi to the scene of the murder and was described by witnesses as appearing “calm” and “happy” afterwards.
Blencowe also allegedly told a friend after the murder the only thing he regretted was “not watching Connor bleed to death”.
His two co-defendants Bradley Jones and Grant Clemens, who were accused of helping him escape justice, were both cleared of perverting the course of justice.
After the murder Blencowe changed his clothes and got a lift to Stratford-upon-Avon, where he was arrested the following day.
The jury heard how when he was taken into custody he “giggled” when he was told it was on suspicion of attempted murder.
During the trial Blencowe claimed he was not responsible for his actions when he killed the teenager because he was suffering from a mental disorder, and Connor came at him with a knife.
But by its verdict the jury determined he either intended to kill his victim or cause him really serious injury.
Defence barrister Adrian Amer said: “I ask your honour before you pass sentence tomorrow please remember that Will Blencowe has suffered significant mental health problems in his life.”
Judge Eccles said he would sentence Blencowe this morning.
September 2013: Will Blencowe and Aimee Harrison break up after four years together.
February 13, 2014: Will Blencowe leaves his home in Oxford Road, Banbury, withdraws £100 in cash and takes the train to Oxford. He takes a taxi from the station to Connor’s flat in Fairacres Road at about 6.30pm and stabs the 17-year-old 15 times. He then gets back into the taxi and asks the driver to take him to Witney, to meet his mother Karen Lord, who drives him to meet his best friend Bradley Jones. At about 9.30pm, Blencowe and Jones arrive at Grant Clemens’s house in Moreton-in-Marsh, before Blencowe gets a lift to Stratford-upon-Avon. There he checks into the Linhill Guest House under the name Shane Williams.
February 14: Blencowe is arrested at the guest house on suspicion of attempted murder.
February 15: Bradley Jones is arrested just after midnight. He is then released without charge.
Connor Tremble dies at the John Radcliffe Hospital in Oxford. Blencowe is questioned again, this time on suspicion of murder.
February 19: Grant Clemens is arrested on suspicion of perverting the course of justice.
February 20: Bradley Jones is arrested again on suspicion of perverting the course of justice.
August 11: Will Blencowe pleads not guilty to a charge of murdering Connor Tremble and all three men go on trial at Oxford Crown Court.
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