Detectives from Nepean Police District are investigating the circumstances surrounding the serious assault of a man in Penrith last year.
About 11.30pm on Saturday 13 October 2018, a 44-year-old man was in his unit on Blaxland Avenue, Penrith.
He noticed a group of men outside his unit block that appeared to be breaking into a vehicle.
He walked outside and as he approached the group he was assaulted.
He suffered serious head injuries and will require ongoing treatment.
Detectives have formed Strike Force Bonython to investigate the assault and are appealing for witnesses to come forward.
Early investigations suggest the same group may have been involved in an altercation earlier that night (Saturday 13 October 2018) at a licensed premises in the Penrith CBD.
Anyone who may be able to assist with their inquiries should contact Nepean detectives on (02) 9677 7578, or Crime Stoppers on 1800 333 000.