People in the area were told to delay their journeys and to expect delays in both directions.
Motorists in the area were also advised to consider using SH20 - via the Waterview Tunnel - as an alternative route between the city and Manukau.
Just before 1pm, police told the Herald in a statement: "We can confirm a person has died following the earlier incident this morning.
"At this stage, it is believed the driver has suffered a medical event and sadly passed away at the scene."
The incidents were among several crashes and breakdowns that affected the Auckland motorway network early today.
Transport authorities reported a crash on the north-western motorway just before 9.30am. The crash happened near the St Lukes Rd overbridge.
SH16 NORTHWESTERN MWY, EASTBOUND - 9:25AM A crash is blocking one middle lane citybound just prior to St Lukes Rd overbridge. Pass either side with care and expect delays. ^TP pic.twitter.com/LgBzBCNOm1
— Waka Kotahi NZTA Auckland & Northland (@WakaKotahiAkNth) November 25, 2020
Motorists are being urged to be careful while emergency services respond to the incident.
"Pass either side with care and expect delays."
Earlier, a breakdown heading northbound on the Auckland Harbour Bridge also caused delays after it was first reported at 8.55am.
Just before 10am, the Auckland Motorways traffic dashboard reported it was taking about an hour to get from Albany to Manukau - via SH18/16/20.
That journey normally takes about half-an-hour, transport authorities say.
SH1 AKL HBR BRIDGE, NORTHBOUND - 8:55AM A breakdown is blocking the left lane (lane 1 of 3) northbound currently. Pass with care and expect delays. ^TP pic.twitter.com/EDHVJenuq3
— Waka Kotahi NZTA Auckland & Northland (@WakaKotahiAkNth) November 25, 2020