Detectives have released images of a man they wish to speak to over the death of a woman in an inner-Melbourne park yesterday morning.

Emergency services were called to Princes Park at Carlton North between Royal Parade and Princes Park Drive after a passer-by found the body of a woman shortly before 3am.

Homicide Squad Acting Inspector Andrew Stamper told media the man immediately contacted emergency services after he came across the woman.

Police released these images of a man in relation to their investigation. (Victoria Police) (Supplied)

Detective this morning search the field extensively for clues. Picture: AAP (aap)

Paramedics who attended the scene failed to revive the woman, who is believed to be in her 30s and yet to be formally identified.

Last night, police released a series of images of a man who may be able to assist with their enquiries.

The Caucasian man is wearing a grey hoodie and carrying a backpack in the photos.

Police are treating the woman's death as suspicious and are set to perform an extensive line search of the area, with authorities to remain at the scene for "quite some time".

Police say there are no known links to the sex attack in Parkville but they are keeping an open mind.

"We're calling for anyone who may have been in the area of Princes Park or Princes Park Drive any time during the morning, but specifically around 2.40am to contact Crime Stoppers," Mr Stamper said.

"There will be a long day out here (and) a lot of resources are getting put into this investigation."

The body was found near a popular running track. (9NEWS) (9news)

Officers are treating the discovery of the body as suspicious. Picture: 9NEWS (9news)

Police have locked down the park in Carlton North after the woman's body was found. Picture: 9NEWS (Supplied)

He also said that, at this stage, the passer-by is being treated solely as a witness while he assists police in their enquiries.

The soccer field is located in the middle of a popular park and running track that is close to Melbourne University and its adjoining colleges.

A number of joggers were yesterday turned away after police blocked access to the area.

Officers spent the day working with SES volunteers to comb through the field in the search for clues.

Police have performed a line search of the park and the surrounding area. Picture: AAP. (AAP)

The exact circumstances surrounding the incident are yet to be established and the investigation is ongoing.

The discovery comes just months after a separate sexual assault of a woman occurred at around 2.35am on March 28 in the same area.

Police are investigating whether there is any link between the two cases, however at this stage are yet to confirm any connection.

Acting Inspector Andrew Stamper from the Homicide Squad said police are strongly urging the public to assist them with any information for the investigation. Picture: AAP. (AAP)

Superintendent David Clayton of the Victoria Police also urged members of the local community around the park to be aware of their surroundings and personal safety.

"The message we will provide to all members of the community is to take responsibility for your safety," he said.

"This is an area of high community activity... so just make sure that you have situational awareness, that you're aware of your surroundings, and make sure that people know where you are.

"If you've got a mobile phone, carry it, and if you've got any concerns call police."

Local police patrols of the area are also expected to increase in light of the incident, with officers deployed on foot, in patrol cars and on bicycles.