A man is in custody after appearing in court on a murder charge over the death of a 26-year-old whose body was found in a blood-smeared Altona unit two days before Christmas.

Jason Ashman, 48, from Kensington, who suffers from ADHD, depression and anxiety, was remanded in custody following a brief appearance at Melbourne Magistrates Court on Christmas Day.

Homicide squad detectives leave the Altona home with bags of evidence. Credit:AAP

Magistrate Franz Holzer said Mr Ashman should undergo an urgent medical review after hearing he also has a back injury and hernia. Mr Ashman will next appear on December 27.

Dwayne Wright was allegedly shot dead between 10pm and 11pm on Sunday in his unit on Civic Parade, Altona.