A man has been charged with murder, a month after a NSW teenager was found in a creek in what was first believed to be a non-suspicious death.

Audrey Griffin, 19, was found half-submerged in Erina Creek in Erina on the Central Coast at 3.45pm on March 24.

Griffin had been declared missing 36 hours earlier.

She was last seen at 3am on March 23 on The Entrance Road in Ernia. 

The death was first deemed non-suspicious by detectives.

When investigators later appealed for public assistance in the case on April 17, they again said it was being treated as non-suspicious.

After extensive investigations, police arrested a 53-year-old man over the death in Surry Hills at 12.20pm yesterday.

Police allege the 53-year-old was involved in a “physical altercation” with Griffin. 

He was taken to Surry Hills Police Station, where he was charged with Griffin’s murder and 11 unrelated domestic violence charges.

He will front the Downing Centre Local Court today.