Officers investigating the death of Daniel Baker in Derbyshire earlier this year have released a CCTV image of a man they believe may have information about the attack.
Mr Baker died after being found in Mansfield Road, South Normanton, shortly after 11.30pm on July 19 suffering from a stab wound.
The man in the latest picture released by police got on a bus at the same time as Mr Baker at Clay Cross the day before he died.
Officers believe he may have spoken to the victim and could be able to help them piece together what happened between the bus journey and his death.
Two people have been charged with murdering Mr Baker. They have been remanded in custody to await trial.