22-year-old Wisconsin native Thomas Olson was killed trying to find his mother, who had been run over by a drunk driver.
Police said 45-year-old Mary Moore was struck and killed while lying in the street at about 1 a.m. Sunday.
According to WISN 12 News, witness Wendy Muth said she was watching a movie when she heard a loud noise outside and called 911.
"I looked out and saw a body laying there. And I grabbed the phone to call 911. And of course, they were asking me, 'Are they breathing?' I said, 'They're not moving, so should I go out and see?' And you know -- she -- the person was gone already. (I) hope to never see anything like it again."
A few hours later, her son, 22-year-old Thomas Olson, called police to see if they knew where she was.
Olson's fiancee, Latricia Jansen, said:
"They told us that they needed to come to the house to talk to us in person."
When Olson heard that, he and two friends took off in a sport utility vehicle, racing to try to find his mom at a hospital.
The driver of the SUV told police he was driving westbound on Becher Street at 90 mph.
When he tried to maneuver a curve, he lost control, and the SUV overturned near the intersection of 90th Street and National Avenue. They hit a parked dump truck.
Olson was thrown out of the vehicle and died en route to the hospital.