A man who was allegedly armed with a knife and covered in blood has been found dead moments after jumping into the rear of a vehicle at an intersection in Adelaide's north-east on Saturday morning.

Key points: Police said the man jumped into the rear of a small red sedan asking to be taken to hospital

Police said the man jumped into the rear of a small red sedan asking to be taken to hospital The driver of another car witnessed the incident and intervened by ramming the vehicle from behind

The driver of another car witnessed the incident and intervened by ramming the vehicle from behind The man is believed to have walked off and collapsed and was found dead by police

Police said the man's body was found following an "incident" at Golden Grove at about 11:30am after patrols were called to the intersection of Marie Clark Drive and Bicentennial Drive.

The man was allegedly armed with a knife and covered in blood and had jumped into the rear of a small red sedan, asking the driver to take him to hospital.

Police said the driver of another vehicle witnessed the incident and intervened by ramming the vehicle from behind.

"The driver of a four-wheel drive travelling behind who witnessed the man get into the car and fearing for that driver's safety, deliberately drove into the small red sedan," police said.

"The man got out and walked off and was found a short time later collapsed in Jacaranda Grove. Despite the efforts of paramedics, the man died."

Police are conducting further investigations into the man's death. ( ABC News: Meagan Dillon )

Police said they would conduct further investigations but at this time the man's death is being treated as not suspicious.

Jacaranda Grove was closed for several hours following the incident and police are now appealing for any vision from the public.

Police said neither of the drivers were physically injured in the incident and have asked anyone who may have witnessed the incident to contact police on 131 444.