Police are asking for help in finding a man wanted in connection with the murder of a 17-year-old boy in Cardiff.
Two men have denied murdering Aamir Siddiqi in Roath.
Mohammed Ali Ege, 32, from Riverside in Cardiff, is wanted on suspicion of conspiracy to commit murder.
Aamir was attacked at his home in Ninian Road at about 1340 BST on Sunday 11 April and died of stab injuries. His family joined police in appealing to the Asian community for information.
The teenager's parents Iqbal, 68, and Parveen, 55, were also seriously injured in the incident.
Mohammed Ali Ege is black, 5ft 10ins tall, slim, with black shaved or cropped hair, brown eyes. Police say he is of Middle Eastern heritage and has a Welsh accent.
He is known to have contacts across Cardiff, Pontypridd, and Barry.
Detectives say the public should not approach him directly but call police immediately if they have any information about where he is.
People should contact the major crime incident room at Cardiff central police station on 02920 527 303 or Crimestoppers on 0800 555 111.
For immediate sightings the public are asked to dial 999.
Two men, aged 36 and 37, are in custody charged with Aamir's murder and the attempted murder of his parents.
Aamir's sister Nishat Siddiqi also appealed for help from the Asian community in tracing Mohammed Ali Ege.
She said: "An important element of the on-going investigation is the assistance which can be provided by our community to the police.
"It will be of tremendous value if we can trace the suspect (Mohammed Ali Ege) who is required by the police for their investigation.
Miss Siddiqi added: "If you have any piece of information about them, please pass it onto the police without delay.
"For the sake of justice and to maintain peace and security in our society, the perpetrators involved in this crime must be brought to justice as soon as possible,
She said the four months since her brother's murder have been "an enormously difficult time for us as a family".
She also praised the "tremendous support" that the family has received from friends, members of the Cardiff community, and the police who she said have "worked tirelessly".