Police have renewed their appeal for information on the first anniversary of a Cardiff teenager's killing.
Two men have been charged with Aamir Siddiqi's murder at his family home in Ninian Road, Roath, in April 2010.
Officers are still searching for Mohammed Ali Ege, who is wanted on suspicion of conspiracy to commit murder.
Aamir's parents have also issued a tribute to their "gentle and loving" son.
Aamir, 17, died of stab injuries after he was attacked at about 1340 BST on 11 April 2010.
His parents Iqbal, 68, and Parveen, 55, were also seriously injured.
The suspects, aged 36 and 37, have also been charged with the attempted murder of Aamir's parents.
Mr Ege, 32, from the Riverside area of Cardiff, featured in a BBC Crimewatch appeal in September last year.
He is described as black, of middle eastern heritage, 5ft 10in (1.5m), slim, with black shaved or cropped hair, brown eyes and a Welsh accent.
He is known to have contacts locally and throughout the UK.
The public are advised not to approach him directly but to call police immediately if they have any information regarding his whereabouts.
Det Ch Insp Paul Hurley said: "On the anniversary of Aamir's death our thoughts, as they have been since April 11 2010, are with Aamir's family and friends who continue to grieve and miss such a talented and loved young man.
"Over the last 12 months, we have been overwhelmed by the support and information from the community which we continue to receive.
"If there is anyone with information who has not yet contacted us for whatever reason, I would urge them to please do so immediately."
In a statement, Aamir's family said the pain of his death was still raw.
"From the day he was born, Aamir was loved but in return, he was the most loving person we knew.
"He lifted everyone's spirit and it was a great joy and honour to know him.
"His infectious enthusiasm for life was evident from the start and he was always an optimist. We miss his affection, laughter and his rare ability to always see the good in everyone.
"His nature was incredibly gentle and this makes what happened all the more shocking for us. His loss has devastated us all and he will never be replaced."
Aamir had hoped to read law at university in Cardiff.
His family thanked relatives, friends and the wider community for their support.
They also paid tribute to the hard work of South Wales Police.
A reward of up to £10,000 is available for any new information leading to any further arrests and subsequent convictions in relation to Aamir's murder.
Anyone with information regarding the whereabouts of Mohammed Ali Ege or other details contact contact the major crime incident room at Cardiff Central Police Station on 029 2052 7303 or Crimestoppers anonymously on 0800 555 111. For immediate sightings of Mohammed Ali Ege dial 999.