Police are trying to identify a potential witness to a murder on the Sunshine Coast earlier this month.

David Collin, 53, was attacked as he slept in his sleeping bag at the back of a community centre on Millwell Road East in Maroochydore on September 9.

David Collin was killed as he slept. (Queensland Police)

He was found dead the next morning.

Investigators are seeking the public's help to identify a person, possibly a woman, seen on CCTV coming from the southern direction of Evans Street before reaching the intersection and crossing School Road, on Sunday September 8.

The person appears to turn around a number of times as if they heard something.

This appeal follows another by police last week to identify a male seen on a pushbike about 10.30pm on the same CCTV.

Police believe this person captured on CCTV may have witnessed the murder of David Collin. (Queensland Police)