A woman found near John Nolen Drive early Friday suffered life-threatening stab wounds, Madison police said.
The suspect, Tony M. Mason, 63, was still at large as of Friday evening.
The victim and Mason knew each other, said Madison police spokesman Joel DeSpain.
The 911 center said the stabbing was reported at 12:13 p.m. near the Capital City Path Downtown.
The victim, who DeSpain said is in her 40s, was in surgery Friday afternoon. She was stabbed several times inside the vehicle after something like an argument took place, he said.
After the woman was stabbed, she somehow got out of the vehicle Downtown along John Nolen Drive near Broom Street before the assailant drove off, DeSpain said.
He said this was an isolated incident and that he doesn’t believe there is an ongoing threat to the public.
The motive behind the stabbing is unknown, he said.
Mason is 6-feet-2 and 165 pounds. He was driving a 2010 black four-door Nissan Sentra with a broken right-rear window and a “Quality Transit” decal on the right-rear door.
Anyone with information about Mason’s whereabouts is asked to call 911 or Madison Crime Stoppers at 608-266-6014.