Police say the incident began around 3:15 pm when a 52-year-old man and his wife saw a man slumped over the wheel of a truck in the northbound lane of the 4000 block of Division Street.
When the couple made contact with the truck driver to see if he needed help, he awoke and sped away.
A flatbed trailer loaded with lawn care equipment attached to the truck struck the good samaritan and rolled over him, causing fatal injuries.
Another motorist followed the fleeing driver, and called in the truck’s license plate number.
Several hours later, Plymouth County and Iowa state troopers spotted the vehicle on county road C-38.
The driver fled again but was forced off the road by a deputy.
The suspect, 29-year-old Dustin Suppi, of South Sioux City, was taken into custody. He is in custody in the Woodbury County Jail charged with leaving the scene of a fatal accident.
Other charges are pending as the investigation of the incident continues.
By Woody Gottburg, KSCJ, Sioux City